Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce65ad5fdf27ee2b…

MALICIOUS

PDF

73.6 KB Created: 2020-12-27 01:47:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60cfb1503583aaea79baa75a1f76dbaa SHA-1: 589068141744b393662619d7b557d66c9e8b43d8 SHA-256: ce65ad5fdf27ee2b37a9802dd61e73d8334bee1acdbf3c80553bf98aa316dd64
194 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, including one that appears to be a search result lure. The presence of multiple disposable hosting domains and UTM parameters suggests an attempt to obscure the ultimate destination or to track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafffe.ru/123?utm_term=how+to+feed+on+corpses+in+skyrim+werewolf
    • https://cdn.sqhk.co/wiberini/plPg1hg/20082826041.pdf
    • https://latijazaw.weebly.com/uploads/1/3/4/3/134312978/dobiladakiz.pdf
    • https://cdn.sqhk.co/fevivesuxofo/jeTxgec/kisaxubukofozefiwod.pdf
    • https://xazopitanajemav.weebly.com/uploads/1/3/4/7/134714933/luzegamu-sedofuwakeli.pdf
    • https://verikadofaja.weebly.com/uploads/1/3/2/3/132303102/viwejod_mapukiduf_luwisak.pdf
    • https://cdn.sqhk.co/pofifarim/icibiiL/28700239951.pdf
    • https://todurudivi.weebly.com/uploads/1/3/4/3/134344361/f0c9b90074b270.pdf
    • https://turexebino.weebly.com/uploads/1/3/4/2/134265835/reloku.pdf
    • https://sakafafemowuva.weebly.com/uploads/1/3/4/6/134694971/a0b51f082845.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wupixufekijax/kewatuseg.pdf
    • https://s3.amazonaws.com/wogikokuzotaxa/ruxulujotugelupawojaz.pdf
    • https://s3.amazonaws.com/dumupa/annexure_d_for_indian_passport.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_off0000e24b.bin
9143caefc5dcbad11bb136dbf0b75934cbae64231358ee7f4297857f7fce5121		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE24B 5308 bytes
font_01_sfnt_off0000f468.bin
0799406172c12d85ba1bd0028181b67494e0c8f79ef838e3962b2b26c6a9b921		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 10916 bytes

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