Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8806e3429b1b584…

MALICIOUS

PDF

83.1 KB Created: 2021-04-01 17:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6b099734e37278a9b69eb93b9b8074db SHA-1: 837f6de3d67115f4069781dd743a7857379e4fa2 SHA-256: d8806e3429b1b584bd10e0deb3fedfb9238a611a70aa92871f15fbd0b101717c
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 0.9998

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://xezojetit.ru/wix?keyword=orangetheory+cancellation+policy+2019 PDF link annotation
    • https://cdn.sqhk.co/nananava/bYf2sji/lusizafazufonadutiduxu.pdfIn PDF document text
    • https://cdn.sqhk.co/nagigureti/SjiZoWK/69888547257.pdfIn PDF document text
    • http://accueilcmb.com/wall_street_journal_prime_rate_history_december_31_2018yz04a.pdfIn PDF document text
    • https://cdn.sqhk.co/wamamuli/hfU30ge/garmin_dash_cam_mini.pdfIn PDF document text
    • http://bcipreactivaperu.com/bewarozudozulevaker49h3f.pdfIn PDF document text
    • https://cdn.sqhk.co/saxamabewido/gjjdphc/mirakemodafivuledutolid.pdfIn PDF document text
    • http://xalowazejadiv.getenjoyment.net/modern_calligraphy_workbook.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/11jgPjc/vuvulevede.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/Mgcqlie/fexiwewop.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/clinical_pharmacology_made_ridiculously_simple_download.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/V3iiGS4/kekusukuwu.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/vawokorut.pdfIn PDF document text
    • http://my-credit.info/manufacturing_planning_and_control_for_supply_chain_management_6th_edition_downloadov9ht.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/1ijjhbr/free_download_idle_miner_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_94e6af9c2f5e42d295ae2cc87214e39c.pdf?index=trueIn PDF document text
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_5797fdc87a884eb98ffae90c00b18e98.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/accdb225-d4de-4a3d-86f1-1d1a79483ed2/13379609307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b201f64-b3fa-497b-adf2-88ba879ad94c/38201073757.pdfIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_92a3ddb17f8e4c108f9e4ad5c127a899.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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 5628 bytes
SHA-256: 2924be25fa67f867b9fff839252ab2c1cf819cfb1521eda7e908723a2fefc17c
font_01_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 10620 bytes
SHA-256: 10d44bcdaa2a396ac7bb374ca55df84b0b64f06d34ee9fcdf0d76b112ac62219
font_02_sfnt_off00012919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12919 16392 bytes
SHA-256: 8976f08d19289f394670e95003dbd7e43d40ab5e55cac77d8d2bd4f89a3a4620