Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc00b1a97abf4e0…

MALICIOUS

PDF

73.8 KB Created: 2021-02-17 12:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 74f4c7e413c758c9319eb289a046c79c SHA-1: b68517421e6d48df782267c9ee595543a16a152a SHA-256: 8dc00b1a97abf4e0577d508bd41f3b51a6669050f6e9103bf0e9fb4af8f25d97
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The embedded URLs suggest an attempt to redirect users to further malicious sites, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://leonvi.ru/strik?utm_term=how+long+do+u+stay+in+jail+in+monopoly PDF link annotation
    • https://cdn.sqhk.co/gusiloxi/SjhOjgp/79524929983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416791/normal_602040802e180.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/0TyGBjh/83931556373.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/CfsQvij/critical_duty_strike_mission_strike_team_shooters.pdfIn PDF document text
    • http://titanovyi-filtr.ru/solucionario_matematicas_1_bachillerato_bruC3B1o6k3na.pdfIn PDF document text
    • http://lovelyhouse.online/62485427999rh426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411498/normal_5fd87a693d162.pdfIn PDF document text
    • http://erethiztzj.space/6471433786ga1xc.pdfIn PDF document text
    • http://menetufebev.22web.org/pudip.pdfIn PDF document text
    • https://cdn.sqhk.co/kasuwajavi/hh8Isji/lego_star_wars_the_force_awakens_minikits_endor.pdfIn PDF document text
    • https://cdn.sqhk.co/jedetanepiz/geiighw/memuzitasawa.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/c0a604e4a.pdfIn PDF document text
    • https://rawabupabazokiz.weebly.com/uploads/1/3/2/6/132695668/8060901.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zukusuvajijip.epizy.com/davimonogipopivepogutovu.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_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 5416 bytes
SHA-256: 7b9f7186498b7edb4dd29aff7b315884a0121da8b203b870cbffd91851c61684
font_01_sfnt_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 11052 bytes
SHA-256: 70bfe7c2030261a119470cc45b93f3f64091fdbbe54c3a81a774e0086a39d985

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