Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ff1d78d97ecc25…

MALICIOUS

PDF

81.0 KB Created: 2021-06-02 10:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26cd1dafd31d9066350fe6fd68f5647a SHA-1: 795723545d1b1794460b15f53c6f3d68a5b52c27 SHA-256: 86ff1d78d97ecc2572d8d5a45c75e3c379e8e8666f5930c4b555e6884039ab04
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, but one key URL points to a domain associated with malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the linked content. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://inwebjor.ru/pbw?utm_term=data+analysis+and+decision+making+with+microsoft+excel+revised+pdf
    • https://cdn-cms.f-static.net/uploads/4453134/normal_606e2d2473e87.pdf
    • https://cdn-cms.f-static.net/uploads/4380229/normal_601fc9f829cba.pdf
    • https://pusakinadolelu.weebly.com/uploads/1/3/2/6/132682110/2f15e.pdf
    • https://cdn-cms.f-static.net/uploads/4412606/normal_6013a5c7aab5d.pdf
    • https://besivopu.weebly.com/uploads/1/3/4/7/134705308/5861417.pdf
    • https://gojolukok.weebly.com/uploads/1/3/4/4/134455450/7e809.pdf
    • https://mizededul.weebly.com/uploads/1/3/4/0/134040812/4104075.pdf
    • https://cdn-cms.f-static.net/uploads/4472773/normal_603b3957aae6d.pdf
    • https://kelodulelonax.weebly.com/uploads/1/3/4/6/134644310/vikomotipazibi_sabibefovur_kegusaguxeroj_pisujozoguberib.pdf
    • https://raguwamirib.weebly.com/uploads/1/3/4/6/134630778/zeruladilameg.pdf
    • https://bisodipodur.weebly.com/uploads/1/3/4/5/134592442/5661550.pdf
    • https://static.s123-cdn-static-d.com/uploads/4461786/normal_60afffc930947.pdf
    • https://pexaxodosusa.weebly.com/uploads/1/3/0/8/130874045/wilokagugoriviwaki.pdf
    • https://dovejopizodumu.weebly.com/uploads/1/3/4/8/134883147/mumezedef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1871f623-c6fa-4313-8731-9f4a4b31934a/janafubowutewef.pdf
    • http://wikoborumun.pbworks.com/f/what_is_literal_and_nonliteral_meaning.pdf
    • http://wojipag.pbworks.com/w/file/fetch/144423747/roropafifawokubawowoxi.pdf
    • http://togusan.pbworks.com/w/file/fetch/144427545/pezapekamezidobejejufapal.pdf
    • https://uploads.strikinglycdn.com/files/9fe6cb21-b2fe-4bf9-a883-7327c1141b05/lakenanarema.pdf
    • https://uploads.strikinglycdn.com/files/23cd8adc-11ed-46d0-8bff-d1965e40691d/50943956860.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_off0000fd4b.bin
0707c340b231eff45525e8a8f2205d1400abffdd152e767e525ad269b1b7f8cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 5956 bytes
font_01_sfnt_off00011198.bin
fe2a5928a09939fad1231e8fa5c4899960bec49af26e5c1d1a6a9791048a477e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11198 10680 bytes

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