Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e91a85459bda27…

MALICIOUS

PDF

99.4 KB Created: 2021-03-29 05:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 24a862e4efcc3b01f98d2e16f3cf81f6 SHA-1: 5a0567752e6f3657432302f5cfcfae995c57f108 SHA-256: 67e91a85459bda27ae43abab727550c2e42dea5ca0066456d49005eb7777234f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://kuzutuzo.ru/award?keyword=resistencia+a+antibioticos+pdf+2020 PDF link annotation
    • http://sowufevoga.iblogger.org/toxinebejuromawuluzif.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/mugafexa_wonoro.pdfIn PDF document text
    • http://wutoxurusot.iblogger.org/dakomaludarewalebun.pdfIn PDF document text
    • https://wopokajam.weebly.com/uploads/1/3/0/8/130874492/49f10f.pdfIn PDF document text
    • https://subokolabipu.weebly.com/uploads/1/3/2/3/132303028/4047685.pdfIn PDF document text
    • https://jixivegeparimes.weebly.com/uploads/1/3/4/7/134749144/2700485.pdfIn PDF document text
    • http://lesorurudefige.iblogger.org/microsoft_access_database_engine_2007_free.pdfIn PDF document text
    • http://fujubipe.22web.org/persona_4_golden_margaret_social_link_guide.pdfIn PDF document text
    • https://rawuwivusezorom.weebly.com/uploads/1/3/1/4/131406564/japol.pdfIn PDF document text
    • http://luzesawajipux.iblogger.org/39477714883.pdfIn PDF document text
    • https://xufetujada.weebly.com/uploads/1/3/4/7/134745175/5122507.pdfIn PDF document text
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/2555296.pdfIn PDF document text
    • https://tukobigerokigab.weebly.com/uploads/1/3/4/6/134653943/228a950.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sewewixa.epizy.com/bosch_silence_plus_46_dba_manual.pdfIn PDF document text
    • http://xegefonupekowa.epizy.com/what_is_the_salary_of_bba.pdfIn PDF document text
    • http://satovixu.rf.gd/mopalenatoxabawawe.pdfIn PDF document text
    • http://didejanumaxunef.rf.gd/4787868050.pdfIn PDF document text
    • http://gisudaledusuroz.rf.gd/kedejixozotewebolafizopi.pdfIn PDF document text
    • http://pegeligoxosoxuz.epizy.com/35956643572.pdfIn PDF document text
    • http://bodufusuviv.epizy.com/43514009298.pdfIn PDF document text
    • http://mopajob.rf.gd/how_to_learn_sanskrit_for_beginners.pdfIn PDF document text
    • http://kefujuvaw.epizy.com/hashar_punjabi_movie_full.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_off00014455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14455 5440 bytes
SHA-256: 7768850af003899551029ec2c162f55c990283c96120d9a4c1c120d0def6711b
font_01_sfnt_off000156eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156EB 12376 bytes
SHA-256: 72241eed8481d4dd3b5213d5501c8fb51d2c64fc61ccdd4972721f32511d98ae

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