Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bffe011d7534589…

MALICIOUS

PDF

74.2 KB Created: 2021-02-23 18:08:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ccbeb7e1538cc17cbf462ea2dedb71b7 SHA-1: afbe53635cdcabb82d1b9d6b7dc1eefbe62a5d1a SHA-256: 9bffe011d75345895da0b452c379337ac0f047a3c8e2f90d2bc9a44bf20f5379
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. The heuristics indicate it functions as a link farm, with many URLs pointing to disposable hosting, likely for SEO manipulation or redirecting users to malicious content. The presence of a link to known malicious redirector infrastructure further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=how+to+replace+beats+solo+2+wireless+ear+pads In PDF document text
    • https://ninofupefuf.weebly.com/uploads/1/3/1/8/131856131/3f76c0da9.pdfIn PDF document text
    • http://introdom.ru/oblivion_hermaeus_mora_guideqnjz8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489852/normal_5fff7b45a2b87.pdfIn PDF document text
    • https://dominisu.weebly.com/uploads/1/3/1/3/131379959/8204b977.pdfIn PDF document text
    • http://gogejevi.iblogger.org/journeyman_electrician_exam_study_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389792/normal_5fe1b9032a372.pdfIn PDF document text
    • https://liwitozawaben.weebly.com/uploads/1/3/4/0/134042828/wememevep.pdfIn PDF document text
    • https://nigoriwidoke.weebly.com/uploads/1/3/5/2/135296580/4a4e2dd500e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476750/normal_6029ce23cf586.pdfIn PDF document text
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/d4b7d056.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417995/normal_6005a0c2b089f.pdfIn PDF document text
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/db7f40529.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/bounce_game_cheat_codes_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/pose_season_2_episode_9.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/which_is_best_apple_iphone_or_android.pdfIn PDF document text
    • http://tizepadeda.rf.gd/er_app_apk_for_firestick.pdfIn PDF document text
    • http://nidemavaguwagev.rf.gd/credit_analyst_cv_format.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_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 5392 bytes
SHA-256: 78ce311ed031f260a6301c75ed544d19d8da2a61891a289cd8a9ac1fcc0599d1
font_01_sfnt_off0000f620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 10632 bytes
SHA-256: d3f19e022f07b01f0c51f141bf68a32f2c6b638d9a4d4d9f3f5f1cd17e640104

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