Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8626cf3fab75ef8…

MALICIOUS

PDF

81.5 KB Created: 2021-02-07 22:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a9adee2fe04dbb27e797ee93177f0134 SHA-1: c1fb37c7622941e9bd26f6513a24f5eda24554fe SHA-256: f8626cf3fab75ef8d2e69a3ccbd069d05d72aef77e0560a3f2d527af08f10dfb
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, many pointing to disposable hosting services, suggesting a phishing or SEO spam campaign. The ClamAV detection of 'Pdf.Phishing.Trojan' further supports its malicious nature, likely serving as a lure to redirect users to malicious sites.

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://druttle.ru/wb?keyword=comprehension%20exercises%20with%20answers%20for%20competitive%20exams PDF link annotation
    • https://witabavuwimob.weebly.com/uploads/1/3/4/3/134339013/731058.pdfIn PDF document text
    • https://tabetigilazewa.weebly.com/uploads/1/3/5/3/135392987/takaluki-kobiwus-terovedig-zububogabez.pdfIn PDF document text
    • https://zedabobosarafon.weebly.com/uploads/1/3/0/8/130813357/4800266.pdfIn PDF document text
    • http://gosologesegob.iblogger.org/kadidavugusasojoga.pdfIn PDF document text
    • https://sorurilinoko.weebly.com/uploads/1/3/5/3/135397097/4617066.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/fiwiwofixonaboto.pdfIn PDF document text
    • https://lezigumaluneluw.weebly.com/uploads/1/3/1/4/131454696/govurewubedotinaw.pdfIn PDF document text
    • https://goponubinolofuv.weebly.com/uploads/1/3/4/6/134695307/korit.pdfIn PDF document text
    • https://silifasakesi.weebly.com/uploads/1/3/4/5/134510621/0a418e92275537b.pdfIn PDF document text
    • http://luferuvijudadof.22web.org/measuring_length_worksheets_4th_grade.pdfIn PDF document text
    • http://genokoti.iblogger.org/chest_guidelines_2012_orthopedic_surgery.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/regegozumekoza/lelaxuduto.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/hawke_cable_gland_catalog.pdfIn PDF document text
    • http://wupumod.rf.gd/jotagaj.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/75374048363.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 5252 bytes
SHA-256: 6a2523f6cd3e384ffc4db5cd421a28fe0a4e27340bf825db69b21e3a3b3668b6
font_01_sfnt_off000106c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 10448 bytes
SHA-256: 8bc06b7f99642229b84bee46b755271a1f0c42df5d8a061a6300b393c2d82e5d
font_02_sfnt_off00012a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A28 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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