Malicious PDF — malware analysis report

Static analysis result for SHA-256 36dab44bf3480df5…

MALICIOUS

PDF

72.3 KB Created: 2021-01-25 11:44:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 89c5233a61f8c5bb7ca750dda77c2568 SHA-1: b1cc1452b963dbba8842a39f3a234c1420fd3edd SHA-256: 36dab44bf3480df52d30af1a32f02299f6479b15e357369a5b886d1113c99bef
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically appearing as a search result for 'Fallout 4 command to repair power armor'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or scam attempt. ClamAV detection and ML classification further support its malicious nature, likely serving as a lure to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=fallout+4+command+to+repair+power+armor PDF link annotation
    • https://cdn.sqhk.co/guzamuvi/K3WjcPl/94283268124.pdfIn PDF document text
    • https://zuzilumapodebaj.weebly.com/uploads/1/3/1/3/131382406/wekopezenupabumabe.pdfIn PDF document text
    • http://yewes.fun/maze_escape_minecraft_level_19jccp.pdfIn PDF document text
    • https://serutoposax.weebly.com/uploads/1/3/5/3/135398922/509787.pdfIn PDF document text
    • http://jotewelife.iblogger.org/77320464954.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/0iyEtif/zevofiv.pdfIn PDF document text
    • https://gajaxaja.weebly.com/uploads/1/3/2/7/132712369/xoxifiwigu.pdfIn PDF document text
    • http://sport-stavki.fun/659826006453za6y.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/aBfjgjj/ea_sports_ufc_apk_obb_download.pdfIn PDF document text
    • https://jekotufuwin.weebly.com/uploads/1/3/1/4/131406020/5060600.pdfIn PDF document text
    • https://cdn.sqhk.co/narobalof/ieUttjh/big_bang_cast_worth.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ritarejameja.epizy.com/dejusolovemonena.pdfIn PDF document text
    • http://dodarululi.epizy.com/bamubolovin.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/animania_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/comic_relief_2019_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/formule_excel_arrondi_dizaine_infrieur.pdfIn PDF document text
    • http://gomitobovuni.rf.gd/kajogemirame.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/antivirus_application_for_pc.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_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 5176 bytes
SHA-256: 35de1fcac558d75ee42fa3ac2ba1dcddd30b9c1f392c82f3e5287e26eb67f389
font_01_sfnt_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 10056 bytes
SHA-256: 61debcaa53e833dfda16805d0f1902cd8824e8d880c0abeb0671fecf1598a847

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