Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3d44102a5e02f1…

MALICIOUS

PDF

122.8 KB Created: 2021-01-17 23:25:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3f61a6730076b074c407bd0d7d5b1070 SHA-1: 8460587d7eee9ca06ee8a475f82e09696d0fd71e SHA-256: 8a3d44102a5e02f17aac29a100408ef1b16fe3de3987ddda0f3cf0135c978d54
246 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, including a critical detection for phishing and a ClamAV signature. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of numerous external URIs indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://trafffe.ru/123?utm_term=lost+tribe+of+the+sith+pdf PDF link annotation
    • https://cdn.sqhk.co/xafiguzi/idV4ihu/jiravufekovodefuxitizad.pdfIn PDF document text
    • https://dotowukigirer.weebly.com/uploads/1/3/1/1/131163902/jojulejexidepa.pdfIn PDF document text
    • https://lefamadagizid.weebly.com/uploads/1/3/4/7/134704745/rifatewenikorasepu.pdfIn PDF document text
    • https://gumakamatiz.weebly.com/uploads/1/3/4/6/134600955/wuvudijezuzetefititu.pdfIn PDF document text
    • https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/bcee4e.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/jhbirDu/84725187212.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/42b34b302fc71.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/dpgipnx/epic_conquest_apk_uptodown.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/mixamaded.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/LhhiiIV/vixogaweniwuxo.pdfIn PDF document text
    • https://varovugunigode.weebly.com/uploads/1/3/4/4/134480676/zoxesidofa_neselike_fiduwasoroboj.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/uEjhobk/stickman_swing_y8.pdfIn PDF document text
    • https://cdn.sqhk.co/lojeliju/f7hfijl/43315658730.pdfIn PDF document text
    • https://cdn.sqhk.co/regomesu/giUUf7o/hettich_drawer_runners_soft_close.pdfIn PDF document text
    • http://lixixivukagoda.66ghz.com/17827387470.pdfIn PDF document text
    • https://woduluzotuni.weebly.com/uploads/1/3/4/3/134373450/vavuxipefew-sefarifimigozo-jitemikiwot-vujatusima.pdfIn PDF document text
    • https://mitivowa.weebly.com/uploads/1/3/1/6/131607237/luzogelut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabowedufup.epizy.com/weronexubaxoz.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_off0001a71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A71F 4968 bytes
SHA-256: 6cb98dc92ff4cc788905a3a4f80c2f556841eceab08cff55ad8a8dc73b17cb6a
font_01_sfnt_off0001b7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7FA 11104 bytes
SHA-256: 88471b4afca0e1b907a7b04ce1816fbd78707d64ef004b9cb65c01b9dc761feb

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