Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08669b3f8fb3121…

MALICIOUS

PDF

63.2 KB Created: 2020-12-15 21:36:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e3404bfbb234eeb2308917b3ee69b2f5 SHA-1: e4917ea50fd4086fa8150dfac042ad9ecfba1b72 SHA-256: a08669b3f8fb3121ef29a68847c4659c229741d0e6c416928e83009b3dc24046
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious content. The primary lure appears to be a "Lord of the flies study guide answers chapter 6" which redirects to a URL containing UTM parameters, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafftec.ru/123?utm_term=lord+of+the+flies+study+guide+answers+chapter+6 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370263/normal_5f8e106914ce3.pdfIn PDF document text
    • https://lemisisax.weebly.com/uploads/1/3/4/4/134494561/mepifalit.pdfIn PDF document text
    • https://ritenevibufu.weebly.com/uploads/1/3/4/6/134639535/c2bf6b87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_5fb9beeb147b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420031/normal_5fafb81add03a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407102/normal_5f9a33319e040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_5fd14505345c6.pdfIn PDF document text
    • https://zejeranuko.weebly.com/uploads/1/3/4/6/134649068/d3370fd.pdfIn PDF document text
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/4297307.pdfIn PDF document text
    • https://lufukosiresefo.weebly.com/uploads/1/3/4/7/134707539/524f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5636e68612547ed7bfc04/t/5fca92df872fef1847c3f5b5/1607111391661/live_earth_wallpaper_for_iphone_7.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc599753398ff75154dc615/t/5fc734a8a038a451bce903d6/1606890664901/death_shooter_3d_mod_apk_revdl.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcea88769d6160944c54a59/t/5fd63c95313c42342b87c2c3/1607875734481/email_template_reject_job_offer.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AB 5704 bytes
SHA-256: beb0a163f3cee9827d8460b28bfeb30effca07d3d4f2baff3235c027c2a3cb52
font_01_sfnt_off0000cd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3C 10244 bytes
SHA-256: 3a500df0b35bd2b737f435d6a8db467394c773bd6d3632d2f57f639f4f01ee6c

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