Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6cf41b2f85fc0f…

MALICIOUS

PDF

73.0 KB Created: 2021-02-15 00:33:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6537fa305c5b3fb23407224ea5a47dd7 SHA-1: 809bcc9db59794bf697527f623e2ec3d97b1636f SHA-256: 1c6cf41b2f85fc0f3ed10c22e1709c91077c71d6c22e3795b16001c105471b43
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect the user to malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://baarspo.ru/123?utm_term=michel+foucault+the+birth+of+biopolitics+summary PDF link annotation
    • https://mavuweginu.weebly.com/uploads/1/3/2/6/132681431/f43f25.pdfIn PDF document text
    • https://musevupuli.weebly.com/uploads/1/3/1/4/131438528/2e526c328e19c46.pdfIn PDF document text
    • https://kaneloko.weebly.com/uploads/1/3/1/4/131408798/9724565.pdfIn PDF document text
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/3b6d5fa0936e.pdfIn PDF document text
    • https://zatuduxe.weebly.com/uploads/1/3/4/5/134595584/pipadozaduwabo.pdfIn PDF document text
    • https://xulozajewe.weebly.com/uploads/1/3/1/3/131384688/vowukek_guxibobipizigik_lefulirifeb.pdfIn PDF document text
    • https://fitetusoxesar.weebly.com/uploads/1/3/1/4/131406062/cfe3597cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lomuper/duwakonidovan.pdfIn PDF document text
    • http://woniladorunuf.epizy.com/dbol_only_cycle_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/b._ed_online_form_2018_last_date.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/nerudufum.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/sekukoxepavewenapizolu.pdfIn PDF document text
    • http://regipikiwubadov.epizy.com/zepelukapifuxisipasup.pdfIn PDF document text
    • http://mawabubobiniz.rf.gd/83975417396.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/chaos_theory_physics.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/27730105313.pdfIn PDF document text
    • http://datidogebe.epizy.com/database_management_system_tutorialspoint.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_off0000e1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B6 5500 bytes
SHA-256: 745a980018da9b03835b5bc0a8c2f028fbf9ec78585ab23999f02bc159a6a584
font_01_sfnt_off0000f457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 9948 bytes
SHA-256: c2ad437f972c3d312fc69e844c2a4f413411878ff258c30d92d5f796c8116d91

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