Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac155ec7f9f730e…

MALICIOUS

PDF

65.6 KB Created: 2021-02-16 17:22:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1acbfecbddbf8adf32cdefacaa95e2b0 SHA-1: 66493bd436bb52e0a35ea2dc7f76e7f601ca6d7a SHA-256: 8ac155ec7f9f730e29bc76e29ceb0389ffc9c65bf3f17b1c3f739e1fc96a145f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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/123?utm_term=hewlett+packard+339a+motherboard+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496391/normal_60191528cfe7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466175/normal_5ffe231ec2efb.pdfIn PDF document text
    • https://duwodalufe.weebly.com/uploads/1/3/3/9/133997525/tusowasuwivev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496585/normal_5ffb2856150be.pdfIn PDF document text
    • https://bajupeboxima.weebly.com/uploads/1/3/5/3/135327322/4067690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379234/normal_5fd884d0cb813.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/Vgd57R1/wigavikevolawo.pdfIn PDF document text
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/3574203.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/group_rows_in_google_sheetslofeu.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/gIhcKii/33080674452.pdfIn PDF document text
    • https://sezavifibeka.weebly.com/uploads/1/3/4/4/134463458/074e5a8f0bbe5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386354/normal_602091dbe8d54.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/tigewibejageju/emotions_draw_the_faces_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/vetirujebaberalopufag.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/bts_run_ep_13_eng_sub.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/coalesce_or_isnull_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/34458161290.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_off0000c430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC430 5712 bytes
SHA-256: 7f32372a7e6aa04be9c9e8c9aeaf8fdc77faf24450f832b5260e81d23d080209
font_01_sfnt_off0000d778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD778 9948 bytes
SHA-256: 550129c21545bbfe97769fb0737fda5cf28239094daa54b70f37b9a799ff9182

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