Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b41d6feb182e0a3…

MALICIOUS

PDF

102.0 KB Created: 2021-03-17 04:17:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 29c0cdcc80970bde8dd495544c4a13ff SHA-1: 24775620db6250cfc846f8761e63fba6799cb95b SHA-256: 7b41d6feb182e0a3140971ace1bedae74b86dd62310035d8715b97753d11c619
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL pointing to 'zajinet.ru', which is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the detection suggest an attempt to redirect the user to a malicious site, likely as part of a phishing campaign or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://zajinet.ru/123?utm_term=captain+marvel+comics PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5fcf9e2f2930f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377388/normal_5fc631b79f338.pdfIn PDF document text
    • http://jibinomazovujug.22web.org/gibero.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/fubarobexasozelerenawi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_5fe9f62892d72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426572/normal_5fc7f78223814.pdfIn PDF document text
    • http://dotekebenutedex.scienceontheweb.net/aap_guidelines_hyperbilirubinemia_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426819/normal_604580beef8c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416787/normal_600896760454c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401517/normal_5fe87a0629372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_60469f6aac8d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529149/normal_5fd9d5b92bee5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecaa0671-1b25-45f3-b49e-0314848d468f/hisense_air_conditioner_window_kit_e5.pdfIn PDF document text
    • http://xotesevuves.epizy.com/37434605946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba36dd4-a45c-4213-8afe-26653dbb1f1e/73623801743.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/anydesk_teamviewer_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66779a77-0f42-4640-afa1-8d147b99f10b/38875972265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/421ffed1-fb93-4ea1-8a6a-27a96acb484c/is_hbo_max_on_firestick_lite.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/97230648552.pdfIn PDF document text
    • http://xiwexuxe.atwebpages.com/fasanikujaburakadivafofob.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/west_antarctic_ice_sheet_thickness.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_off00014f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F42 5044 bytes
SHA-256: b56c46988275d23390d6ca4bc14e0846d12e67233ed15c3b4d19928b431e9373
font_01_sfnt_off00016051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16051 13076 bytes
SHA-256: 04b2d5cd4a749dfd5e6033a1b0609d961d7345d4e26e0c6a49c1ec98ca022e08

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