Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f28c037b039ee5…

MALICIOUS

PDF

101.6 KB Created: 2021-02-11 21:18:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: fade94d8e6bd348b36b834ef1eb74d1d SHA-1: 77232f0f5353c4d2365f592d79124c4493a28857 SHA-256: 35f28c037b039ee5589724bdcadf6825fc10d91c2afacec386e50afdb8e42659
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, including one that appears to be a redirector with a 'utm_term' parameter, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a title that may be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=neptune+god+of+the+sea+pictures PDF link annotation
    • http://morj.space/apartment_lease_agreement_template_free0cng4.pdfIn PDF document text
    • http://6gusevshop.space/1168638740389jj7.pdfIn PDF document text
    • http://scm03.ru/barefoot_gen_volume_26kql8.pdfIn PDF document text
    • http://mijudivoxobo.iblogger.org/49724803788.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485016/normal_5fdeb21db34c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471706/normal_5fef12b789741.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489237/normal_5ff424e759d7b.pdfIn PDF document text
    • http://foxuzopigudomin.22web.org/nodinodukevilaxub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387562/normal_5fdb566b2e531.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://visejatuvun.rf.gd/nulokapefuxux.pdfIn PDF document text
    • http://gajovab.epizy.com/expansion_of_brackets_worksheet.pdfIn PDF document text
    • http://goseletew.epizy.com/aix_basic_commands.pdfIn PDF document text
    • http://nakosaf.rf.gd/hip_hop_dance_steps_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/15351846616.pdfIn PDF document text
    • http://kesofater.rf.gd/offer_letter_email_format.pdfIn PDF document text
    • http://petobesafena.rf.gd/28671831215.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_off00014540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14540 5352 bytes
SHA-256: cff599b49f7a8241544f2aef6828e93d48b434c4ac0e6ee3f101f37eca9ceda7
font_01_sfnt_off00015784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15784 17728 bytes
SHA-256: bc9d6653242c89b1a5c36332af1ddc87c49c701332e9d3ab9cb4a23409154773

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