Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ac8cc60a373f08…

MALICIOUS

PDF

74.9 KB Created: 2021-03-03 20:53:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b5e5aa9a11a59eb65edea941f0cb7ebc SHA-1: 953daeb9c2813b6d17b0ea9adea806cc9e66c11d SHA-256: f1ac8cc60a373f083f97b9b24aa03bf6499b07250b46fe124553999e28a33002
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and Weebly-hosted PDFs, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://resalured.ru/strik?utm_term=bandura+social+learning+theory+quizlet', is directly embedded and likely serves as the primary lure. ClamAV and ML classifiers also flagged this PDF as malicious, indicating it likely serves a phishing or malicious content delivery purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://resalured.ru/strik?utm_term=bandura+social+learning+theory+quizlet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470218/normal_6006696732d77.pdfIn PDF document text
    • https://juwaxevepatasi.weebly.com/uploads/1/3/0/8/130874094/14223.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/7718723.pdfIn PDF document text
    • https://tovumanaxi.weebly.com/uploads/1/3/5/3/135392352/f03296887f9a3.pdfIn PDF document text
    • http://keepmaxi.space/27822632759h8in8.pdfIn PDF document text
    • https://xanuzejo.weebly.com/uploads/1/3/1/6/131637194/bulofo.pdfIn PDF document text
    • https://kezunegewekal.weebly.com/uploads/1/3/1/4/131483031/futewez.pdfIn PDF document text
    • https://xomijati.weebly.com/uploads/1/3/5/3/135329577/703c36d1f116f.pdfIn PDF document text
    • http://nasporte1.fun/physics_resnick_halliday_krane_fl3vi6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463272/normal_60001f8443e5d.pdfIn PDF document text
    • https://zivozisexime.weebly.com/uploads/1/3/2/8/132814465/gejirasinaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459325/normal_5ffcc62d4f05a.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/rerinago/38816089735.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/bounce_ball_games_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/52670875466.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/73931175557.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/bonjour_service_windows_8._1.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_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 5528 bytes
SHA-256: 58a7c2ce320a123732223a93d996f8307967251feec5a11aec380e4976756f49
font_01_sfnt_off0000f9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BC 10772 bytes
SHA-256: 5dd7423abd3860ef2ad1e236f16e4f12204caf960bdc996b70a18d03f6b55018

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