Malicious PDF — malware analysis report

Static analysis result for SHA-256 283582895f2211da…

MALICIOUS

PDF

58.2 KB Created: 2020-12-11 15:02:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9850f2897697fdbd8d9698e554c75568 SHA-1: 17f7b01342fdfb44c5eed078917db0c5bb8e4ea4 SHA-256: 283582895f2211dab37f55e5b14708c578db0f975b343575656ecc5d8b8e1178
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous external links and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://trafficel.ru/123?utm_term=advanced+excel+tutorial+2010
    • https://depuxozepol.weebly.com/uploads/1/3/4/3/134377374/rudujatutax.pdf
    • https://cdn-cms.f-static.net/uploads/4414501/normal_5fb62a5c7c939.pdf
    • https://bozobamawokoruv.weebly.com/uploads/1/3/4/3/134350924/9bf73ec94b93.pdf
    • https://kofenidez.weebly.com/uploads/1/3/4/8/134890612/7895692.pdf
    • https://static.s123-cdn-static.com/uploads/4409243/normal_5fc90a845077e.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/b4b3eb38b.pdf
    • https://static.s123-cdn-static.com/uploads/4368506/normal_5fcf3c83705b6.pdf
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/ganofajelubasuj.pdf
    • https://cdn-cms.f-static.net/uploads/4368969/normal_5fb965f0ee87c.pdf
    • https://static.s123-cdn-static.com/uploads/4420240/normal_5fcdb68ce72fa.pdf
    • https://cdn-cms.f-static.net/uploads/4479460/normal_5fbb72dd1a0da.pdf
    • https://cdn-cms.f-static.net/uploads/4425483/normal_5fbdeccb37bd3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc5cd39d26ff1194f957f3c/t/5fc900693435706273baf201/1607008362152/forward_assault_mod_apk_unlimited_credits.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab01.bin
3ad17c1c45385dd4f2294bc1d3553122ee715b75b23da679cb2a04883e99496b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB01 5200 bytes
font_01_sfnt_off0000bcc6.bin
89e5b1638129a2bf0c389e9d1aad91586b190a78d7ba573634f1513ec7b14a15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC6 9252 bytes

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