Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5429056ed69610…

MALICIOUS

PDF

70.5 KB Created: 2020-12-19 01:54:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71d75ea7c0c311f8276d65a91ed30ea5 SHA-1: 580f4ba16ef3e3331746392eebce301502faf657 SHA-256: ef5429056ed69610d49fd501b8001c29fd7df3fa008466ce3e8c6c17adf8c294
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to drive traffic to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/strik?utm_term=how+to+pick+asparagus+wild
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5fbcc0917ef04.pdf
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f871e2abd548.pdf
    • https://bobixazila.weebly.com/uploads/1/3/4/5/134599816/gubiv_xazekikopevovo.pdf
    • https://cdn-cms.f-static.net/uploads/4407060/normal_5fab08fd6b11c.pdf
    • https://static.s123-cdn-static.com/uploads/4369633/normal_5fdd28d851cf2.pdf
    • https://molisemopum.weebly.com/uploads/1/3/1/4/131437834/112cf8ce.pdf
    • https://cdn-cms.f-static.net/uploads/4380237/normal_5f8c8654f3c01.pdf
    • https://cdn-cms.f-static.net/uploads/4466161/normal_5fbf3f8991be2.pdf
    • https://cdn-cms.f-static.net/uploads/4406456/normal_5fc14870b6e6e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lerezazo/33536115461.pdf
    • https://static1.squarespace.com/static/5fc112c117e7202640eb3140/t/5fc589e1e6d49a06bb50eb7d/1606781409274/elite_dangerous_orca_build_2020.pdf
    • https://s3.amazonaws.com/kewakuko/26954229109.pdf
    • https://s3.amazonaws.com/genedonapubefe/dipudasax.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7c4.bin
fcd171b2e0a649a9c741b84cb67f7a1fd7c955ba3561a937c20ba4ae59632f21
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 5360 bytes
font_01_sfnt_off0000ea1f.bin
2ab353d244a7911babe10f33c0c6d14cfea03ef47413c81f7151ce7865382072
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 10412 bytes