Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b441c7f87a3f99…

MALICIOUS

PDF

71.1 KB Created: 2021-03-05 06:09:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5abc72f669479aa75d4a5d237799735b SHA-1: 5e7b2d1ac022b869c9a9b43cd57d7b53f99f315f SHA-256: 56b441c7f87a3f99b83a95f0c7b90841d5226d767a1923eb4927792806f6df9e
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm suggests an attempt to manipulate search engine results or distribute content through numerous external links, likely leading to phishing or malware.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=2009+victory+vision+repair+manual In PDF document text
    • https://static.s123-cdn-static.com/uploads/4414487/normal_5fd0800cd4902.pdfIn PDF document text
    • https://mafobosapufi.weebly.com/uploads/1/3/4/5/134505980/kozowijotonovoku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467004/normal_5fcc8d7638d8b.pdfIn PDF document text
    • https://mobefoba.weebly.com/uploads/1/3/0/7/130776725/852811a1f95a71.pdfIn PDF document text
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/jagoki-lokiri-kowetule.pdfIn PDF document text
    • http://luluxot.iblogger.org/compound_shapes_worksheet_with_answers.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/1122916.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vavilonogamet.epizy.com/11632802436.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/26365253815.pdfIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_be996c03334d427f997d8ba997e5b93d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/is_eating_ice_harmful_to_your_teeth.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/7859902989.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/gonose.pdfIn PDF document text
    • http://zatejufeg.rf.gd/92421171663.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/diwusek.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/49966934019.pdfIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_e6ea94017f3b453b81bc0f89517e4aa2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/ganolod.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/commercial_loan_officer_interview_questions_and_answers.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_off0000d60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60A 5576 bytes
SHA-256: 8c7d707ebf24fa733899f5861191ba2a32ad9e2ec6c6daccd0ca229c6f3c5b15
font_01_sfnt_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 11272 bytes
SHA-256: b6730065d03eb89feed38b9eecafc12516e59292d2eba50c5b1b3115da88c9f0

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