Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9a78fb035b0382…

MALICIOUS

PDF

78.6 KB Created: 2020-11-23 07:24:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 04e454d113a84ff1c1bca42da6c67c8c SHA-1: 08214ea4faea0c7d7f0edd31179d7e2d8925d50d SHA-256: 8c9a78fb035b0382daa2d0a6c038d91e23d0122f10c3776d8ceeebf753db18d0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to lure users to malicious content.

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://traffnew.ru/aws?utm_term=certificato+di+conformit%25C3%25A0+auto+ford PDF link annotation
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/zakawosemut.pdfIn PDF document text
    • https://pexazunawilaga.weebly.com/uploads/1/3/4/2/134265520/sigepuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371246/normal_5f8f930e2a8b8.pdfIn PDF document text
    • https://namokokesovu.weebly.com/uploads/1/3/4/4/134480524/980569.pdfIn PDF document text
    • https://monuwapomobi.weebly.com/uploads/1/3/4/7/134730240/520425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453575/normal_5fa5f13eec7c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_5fa037b8848bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378383/normal_5fad81bc22877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370059/normal_5f93c2bb4fc46.pdfIn PDF document text
    • https://rawixokuboja.weebly.com/uploads/1/3/4/0/134097397/0b1e34685989f5.pdfIn PDF document text
    • https://rebumazezip.weebly.com/uploads/1/3/4/8/134860465/566fdb1f8f1e992.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/98641daf-4cc5-41c1-bf55-6463413e7f34/ssas_interview_questions_and_answers_for_6_years_experienced.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/potato_salad_dressing_recipe.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_off0000cdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC0 12892 bytes
SHA-256: 5cbffb4a78fdce02d6403f55626579a7129683c3a56854d1cdaca360d2630aef
font_01_sfnt_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 5096 bytes
SHA-256: 287cd3a6fb7f07df699f8f1433b360ed27634f382944be0e2a91087935226126
font_02_sfnt_off000105d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 11332 bytes
SHA-256: b189480dc5ec7189a04064181edf8bf367c0c31bfe6996be274eae46c149ef27

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