Malicious PDF — malware analysis report

Static analysis result for SHA-256 605607d946eca2a6…

MALICIOUS

PDF

72.1 KB Created: 2021-01-10 15:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 4ff2044b3d64dc605817fcd6d76f249b SHA-1: 3a4776fcc82f042195f629f77dec8fc39219557b SHA-256: 605607d946eca2a6fe4b3a789911f9290634ab6e3b660be870e2326fc11098ed
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious sites. The embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffset.ru/123?utm_term=reliant+electric+motors PDF link annotation
    • https://cdn.sqhk.co/fadanade/ijhjMfg/doa_diamonds_of_atlanta.pdfIn PDF document text
    • https://site-1168003.mozfiles.com/files/1168003/86873941588.pdfIn PDF document text
    • https://site-1177197.mozfiles.com/files/1177197/wupofaxukesewitutevujafi.pdfIn PDF document text
    • https://surejijal.weebly.com/uploads/1/3/4/5/134525532/suwenosaxaton-vowudiw-magetaxovajot.pdfIn PDF document text
    • https://xefakiradu.weebly.com/uploads/1/3/1/8/131856624/f3c992.pdfIn PDF document text
    • https://site-1174034.mozfiles.com/files/1174034/lancome_advanced_gnifique_melting_sheet_mask.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/OgiQhj4/shiftgig_contact_phone_number.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/zomiwefunerajo-fufukarep-jafevavazuw-teruzugavojexol.pdfIn PDF document text
    • https://waniremupamed.weebly.com/uploads/1/3/1/4/131407535/kuriwidupesejaro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/purawuma/accessbet_mobile_app.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD335 4740 bytes
SHA-256: ccebd6ece4f7cb522420827290cce920e7b1f52ec4fcaf832cec73402a00fe44
font_01_sfnt_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 10200 bytes
SHA-256: 118878e5eb44f2c7df2c242c83f7c699b9222f32761aabc81ac84f499ccb26ff
font_02_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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