Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37dec1448277254…

MALICIOUS

PDF

138.8 KB Created: 2021-04-26 08:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a02a54a78f6c0dfb816d0b2a87fe2051 SHA-1: da0e23141c063d438c202d925d9671b840727a26 SHA-256: c37dec1448277254dcd18d14ffb2e3e0f5838d87df4d3d23664411e289aa7213
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9529

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://fokemale.ru/strik?utm_term=atlas+copco+compressor+parts+manual+pdf PDF link annotation
    • http://fowirunuwajuk.iblogger.org/92453339676.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/tegepinavepopakexere.pdfIn PDF document text
    • http://free-at.pro/persuasive_writing_samples_grade_6ri6dn.pdfIn PDF document text
    • http://kewotij.mypressonline.com/biotechnology_of_microalgae.pdfIn PDF document text
    • http://excschool.ru/48351354345llqk7.pdfIn PDF document text
    • http://1xbet-registrat.site/hp_officejet_4500_g510h_driver_for_windows_7qavca.pdfIn PDF document text
    • http://opensalle.xyz/fit_for_life_eating_plan2wbjw.pdfIn PDF document text
    • http://0fruits.space/lafuwoweniw7k6td.pdfIn PDF document text
    • http://boxberry-24.cc/can_you_name_one_object_in_this_photoet72r.pdfIn PDF document text
    • http://kudonolenukiv.22web.org/76090845717.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.orgThisIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://rananutoto.epizy.com/arthrogryposis_multiplex_congenita.pdfIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_76be81667f754fcf9a879732d74194e1.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_02188cb5db0846f3a9eac138bbf0aa4e.pdf?index=trueIn PDF document text
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_4e5abbb427ff4c028909b26df7845be9.pdf?index=trueIn PDF document text
    • http://bukezodebas.onlinewebshop.net/search_engine_free_download.pdfIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_afa0a38d97914382a0c13c2001d4898c.pdf?index=trueIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_ae5ef802739140c48b6b59dc077b58e1.pdf?index=trueIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_33d887ccbf7a4073b68d0130f28deb4f.pdf?index=trueIn PDF document text
    • http://vemewef.rf.gd/11993279734.pdfIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_2c193b3239c142af917ed1f79ebba2a9.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_07f8ee04192745a4a3d349aaf0488259.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://scripts.sil.org/In PDF document text
    • http://scripts.sil.org/OFLAbyssinicaIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F3B 6936 bytes
SHA-256: 817184d1672894702e5b05b50467bc78f588bb34036a809d1ef51bc78e3604eb
font_01_sfnt_off00016091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16091 4552 bytes
SHA-256: 18cbe091a2849e141ac69621a991614cda5101fcb36aa4b8df5284307685cef7
font_02_sfnt_off000170a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170A8 5124 bytes
SHA-256: 20716ed1a673bff3b6d042ed194bac94029902d35302e22c0e2d40ff40273ae8
font_03_sfnt_off000181ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181ED 20588 bytes
SHA-256: 3229feea09e2ece1c06ee6c5bfc8ebaeed83273a38b674d9cb348d3d157de578
font_04_sfnt_off0001a0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0D8 16960 bytes
SHA-256: bd480b571f729ddc1e5a4cbc137ddff23a20b3bea0290f33312217da05f78b82
font_05_sfnt_off0001d67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D67D 16692 bytes
SHA-256: dc2b3c04ac3663dd007f67e2341bceb0b63070eea261fabfb57422315cf930ba
font_06_sfnt_off0001edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EDC3 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
font_07_sfnt_off0001fbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBC3 3884 bytes
SHA-256: f3806f6ec0eecdb1e301ac36ea0b805b2682b8bf4441cb11f1590d4ce1af2cc9
font_08_sfnt_off00020a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A9C 6340 bytes
SHA-256: 6a0bf1daadc663b6ee87be65a51f8590dab23d7e47e85a20a96318253bf3ad56