Malicious PDF — malware analysis report

Static analysis result for SHA-256 e113ea9b054fe17e…

MALICIOUS

PDF

75.8 KB Created: 2021-03-20 02:54:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8bef7a152575ec9b8a63ab26dc15013e SHA-1: 2852f6a97df92956bb5a84b148ec61e16f32e2b0 SHA-256: e113ea9b054fe17ed1666f8eadb0f20a0044fbbb1d0472c540453845148f7b06
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. The primary URL, https://seumenha.ru/award?keyword=comma+splice+examples+and+corrections+pdf, suggests a lure related to academic or writing resources to entice clicks. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://seumenha.ru/award?keyword=comma+splice+examples+and+corrections+pdf PDF link annotation
    • https://cdn.sqhk.co/gobuwovuv/XZghggc/sazuniwinunewalikev.pdfIn PDF document text
    • https://cdn.sqhk.co/nupopobax/tuigDhh/gejerikisopabosajujez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://467375c7-a7a6-4806-a9b7-892c2a528f89.filesusr.com/ugd/911174_b2fb28c62da24af78850edbb4c2acba6.pdf?index=trueIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_55d7134f63854600b3e1c5cb534f70b3.pdf?index=trueIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_d9bfadad3cba41da9fd8c8bfe765ee2f.pdf?index=trueIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_044e4655b367478f843f82877ebd0ea2.pdf?index=trueIn PDF document text
    • http://susupufewowe.epizy.com/tepasimovid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c297c7b9-58a7-4e1d-bb5f-38040f6dd6b6/how_to_set_up_facebook_portal_device.pdfIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_d9dc19c1bd5b4d3d8f4f97adc34b36f3.pdf?index=trueIn PDF document text
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_dc018ffa25b0422da786a7c127b4b95a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91987b99-ca3c-4cce-a7ac-31ece5853a26/taco_bell_power_bowl_nutrition_no_rice_no_beans.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/40392336822.pdfIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_21b4a8bc97a64f11a683e56b8b3a521c.pdf?index=trueIn PDF document text
    • http://befadiw.rf.gd/ujt_relaxation_oscillator_viva_questions_with_answers.pdfIn PDF document text
    • http://vopuxoke.epizy.com/17940061754.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_ee53fd69b9af4464a3d6c4354635cccc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolina/sigmund_freud_psychology.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_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 5272 bytes
SHA-256: 1f43a73d467a858a198220288d9194f5f1bb5195d0f4d35417f77eda6606196e
font_01_sfnt_off0000ff2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 10180 bytes
SHA-256: c3b6ee2f09457bff19280e33f2d0964a09623d2ce1c4862d57655fef31bd1a87

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