Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e6bc792dd9181b…

MALICIOUS

PDF

76.0 KB Created: 2021-03-17 12:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: de56b3560c5e07fa506f590c7e8486fc SHA-1: 43eee48d45233c05e8c6308b30ba94b8e4d85e28 SHA-256: 83e6bc792dd9181b81d2a1c1cafd76e22973782c2066b93cfbefdf0ba957d63c
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, including one identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=adobe+audition+tutorial+pdf PDF link annotation
    • http://igbusinessabouthelp.com/gasaxetajiwedikujawxvpvo.pdfIn PDF document text
    • https://zitidimesefe.weebly.com/uploads/1/3/1/6/131606065/ad5975f2aef006.pdfIn PDF document text
    • http://minuette.me/958229394164jdcc.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/fgfIPjf/spendee_app_alternatives.pdfIn PDF document text
    • https://cdn.sqhk.co/badisasi/hUmOSih/cold_war_call_of_duty_release_date.pdfIn PDF document text
    • https://fosuwelu.weebly.com/uploads/1/3/2/6/132695698/zojolezagamareg_tujon_xezosi.pdfIn PDF document text
    • https://cdn.sqhk.co/pibexezases/jjgifie/87576395348.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/jsNdibq/badlandschugs_net_worth.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/mojivikapeti/dokirofir.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/gogiwoxesalu.pdfIn PDF document text
    • http://lefadubofow.rf.gd/40299257119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38b6c11b-16ea-4eec-8852-f4161f1dddcf/miponogun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e372172-94ec-47ea-9cf1-4ca36fbfb46a/marketing_management_15th_edition_apa_citation.pdfIn PDF document text
    • http://bekogufepe.rf.gd/vobojulakirusafebabifi.pdfIn PDF document text
    • http://gotupodejepu.rf.gd/gonulawose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed3a44d8-7681-4e37-9d1c-741b9f880e6d/dragon_age_origins_companion_conversation_guide.pdfIn PDF document text
    • http://tonunipuwe.rf.gd/maniac_season_1_subtitles.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_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 4984 bytes
SHA-256: 15ad9290395bac64178a8ff574ac671731b0c0e503be57e0488e48a2339bef5e
font_01_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 10752 bytes
SHA-256: 2c4620245dcd1bea8e9aa07c60cd0cf811009aa69012f3cd719e75811d484f4b

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