Malicious PDF — malware analysis report

Static analysis result for SHA-256 c965a9cb2d05a0c4…

MALICIOUS

PDF

91.2 KB Created: 2021-06-07 22:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 996a6d86aabe8208f841ca1bbd3a4410 SHA-1: 057abf8dd3a30ec231f13720145c1e5378340e8c SHA-256: c965a9cb2d05a0c41b253d2773d15a6b7019ec2e28fe89e5d9b3caf646e0e599
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs further supports a phishing or malicious redirection scheme.

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://ketchas.ru/pbw?utm_term=key+elements+of+any+sound+strategic+management+process+include PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426815/normal_5fd3db8f6f22e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_6023f1b37148b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479904/normal_605909a0c8a7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480389/normal_60446ab1585ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476946/normal_604aa1084b861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_6026ae90ce670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457008/normal_605f50e5e135d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482418/normal_6015cd8095a26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_605dce6f85879.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fotikeralo.pbworks.com/w/file/fetch/144759579/how_to_start_a_dropshipping_business_with_aliexpress.pdfIn PDF document text
    • http://gufabewa.pbworks.com/w/file/fetch/144789912/how_much_is_the_ccna_exam_2020.pdfIn PDF document text
    • http://vazesuna.pbworks.com/f/roll_of_thunder_hear_my_cry_book.pdfIn PDF document text
    • http://pijipusap.pbworks.com/f/96041315140.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/w/file/fetch/144466815/fosatafudegeroxex.pdfIn PDF document text
    • http://zufogopojut.pbworks.com/f/begavalefoka.pdfIn PDF document text
    • http://pusavivo.pbworks.com/f/32154813247.pdfIn PDF document text
    • http://nugurafuge.pbworks.com/f/zefelibu.pdfIn PDF document text
    • http://komogabovuwa.pbworks.com/w/file/fetch/144683217/dofovul.pdfIn PDF document text
    • http://sisagexal.pbworks.com/f/landscape_history_and_the_pueblo_imagination.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_off00012801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12801 5544 bytes
SHA-256: 17fedc943ffafb8e6a2cafc04ba68ecc5cc3f87125f76df8a0238c5e6bef603d
font_01_sfnt_off00013adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADC 10540 bytes
SHA-256: 67316d4578ad5df0a7f720337806ec0d44722f31f576b670191016c6b2fee84e

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