Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbf8e95df07fa23…

MALICIOUS

PDF

121.6 KB Created: 2021-05-03 20:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 27dc8b32dbbc2e42e35c846c1232649d SHA-1: b24d5fb138e42363ce1169cdf6f1b8a9cda252ae SHA-256: 3fbf8e95df07fa2313b001ef5a7dba3f7f5d4399ddbca95a2dc076e47040222a
186 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. 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 0.9982

Heuristics 6

  • 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.
  • 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://lozipotod.ru/strik?utm_term=it%2527s+ok+meaning+in+hindi PDF link annotation
    • https://cdn.sqhk.co/kavuweduti/jFFjbhj/android_studio_logcat_text_file.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/7njh4gg/tank_heroes_tank_games_tank_battle_now.pdfIn PDF document text
    • https://ziruxirunilexa.weebly.com/uploads/1/3/0/7/130775543/xijiru.pdfIn PDF document text
    • https://cdn.sqhk.co/dudumadopole/y8ghOlt/70628410674.pdfIn PDF document text
    • http://rogevunesopu.medianewsonline.com/68119822570.pdfIn PDF document text
    • https://cdn.sqhk.co/desiketomasu/eJJiigg/spiritual_warfare_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/hjhhqfc/46372274101.pdfIn PDF document text
    • https://bibatajikoxego.weebly.com/uploads/1/3/5/3/135315017/8824051.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/m0YkKI4/samsung_j415f_flash_file_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/egfP51c/90217812408.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/cliiig9/super_scary_ringtones.pdfIn PDF document text
    • http://xosaparesuroxu.iblogger.org/22573360582.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/2ehbhbK/ice_age_adventures_cheats_acorns_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/solutions_colloids_and_suspensions_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/structure_of_a_text.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/tally_receipt_voucher_format.pdfIn PDF document text
    • http://tuminexozuvino.atwebpages.com/dawaw.pdfIn PDF document text
    • http://tosogaxaf.rf.gd/82908040811.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/72766781894.pdfIn PDF document text
    • http://nibekiwimuzev.epizy.com/pelunupab.pdfIn PDF document text
    • http://batefagut.epizy.com/concierto_de_aranjuez_adagio_piano.pdfIn PDF document text
    • http://lizaduguxo.epizy.com/aafp_guidelines_breast_cancer_screening.pdfIn 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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001425e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425E 8368 bytes
SHA-256: 84d45e66c0b872c22169d4136fca0cae706a652447cf361005e2071f61774692
font_01_sfnt_off00015f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F31 5148 bytes
SHA-256: 3d9a8c97054f91bff88569ff80c4f01a6809a9b42914562cd017a9b6859b8c6a
font_02_sfnt_off00017088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17088 6280 bytes
SHA-256: e2f66974f15c9031d96306ce2351701198aa929777f46904fa6bcf1a85cd628e
font_03_sfnt_off000180ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180EA 3920 bytes
SHA-256: 4468fb5d6ca239cba799c511028e51b3ade20ae6037be8700be6e5169dfcf9b4
font_04_sfnt_off00019046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19046 16292 bytes
SHA-256: b549eba81eefb588a1a87848daff57a6c25d40286024ad2f9807ff55742dfaaa
font_05_sfnt_off0001c038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C038 16616 bytes
SHA-256: e4e65e5cb88e5eb24a16e49bab94391e4f36a2e8e0556a4b156dc8bfe1c3e6da

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