Malicious PDF — malware analysis report

Static analysis result for SHA-256 82723697698b0984…

MALICIOUS

PDF

79.1 KB Created: 2021-01-11 14:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ebeb94583026819e02afacb3afbd2914 SHA-1: 807bd85c5d39f4bd4add3e7ed9095e4c380333b0 SHA-256: 82723697698b0984c506969e36a7c1e8b9bd35dd6622a4871ea5405c50bd3f6c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm or SEO spam document. The primary external URL observed is https://traffine.ru/123?utm_term=introduction+to+old+english+peter+baker+pdf, which is likely used to redirect users to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=introduction+to+old+english+peter+baker+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470038/normal_5fa45bbad0d7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421934/normal_5f9e602d2e431.pdfIn PDF document text
    • https://site-1180431.mozfiles.com/files/1180431/falling_ball_viscometer_calculation.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/69O7udk/10_programming_languages_and_their_uses.pdfIn PDF document text
    • https://site-1166067.mozfiles.com/files/1166067/mobile_passport_control_jfk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490738/normal_5fd9d7e70d9ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365591/normal_5fc4279232399.pdfIn PDF document text
    • https://pulijapejupexeb.weebly.com/uploads/1/3/4/0/134041872/fezofazujedunokutezo.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/40ddfa4d7f4e3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490377/normal_5faefa08f1229.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404523/normal_5ff610957c846.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/publix_oasis_schedule_log_in.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/adventure_time_beemo_game_apk.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 5560 bytes
SHA-256: 4e8c174b04c3ebaaa96cd1da15beb9f092cf7f308e5ce8eb4071132c4f301492
font_01_sfnt_off00010b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6A 10556 bytes
SHA-256: 826e83a2dc3434b51164e4b084e745f3cc830e2c7217ad003c0e57c7abb04099

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