Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa9a0a98c2b8a09…

MALICIOUS

PDF

73.2 KB Created: 2020-12-31 04:57:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c58b333505f6a9e2eb969705437fc294 SHA-1: 760df56920476ffeb5390d8375bf20c0d00468e6 SHA-256: 6aa9a0a98c2b8a09e37d76739f4ccf4639f8cc34b76f1ada0f3f2004fea1f31e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO spam tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

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://traffine.ru/strik?utm_term=bad+north+jotunn+edition+ios+review
    • https://cdn-cms.f-static.net/uploads/4491673/normal_5fdbc32d6c09a.pdf
    • https://cdn-cms.f-static.net/uploads/4486765/normal_5fb77ada0f687.pdf
    • https://static.s123-cdn-static.com/uploads/4499635/normal_5fe43ecd278e5.pdf
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5fb70bc986e6b.pdf
    • https://lewejasolon.weebly.com/uploads/1/3/1/4/131437246/pikunamadokesozav.pdf
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/kabitazibe.pdf
    • https://rodironamo.weebly.com/uploads/1/3/5/3/135347674/8204258.pdf
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/mupagosevudelimegade.pdf
    • https://cdn-cms.f-static.net/uploads/4452621/normal_5fa3092eaec72.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gateme/88620002644.pdf
    • https://uploads.strikinglycdn.com/files/69b75e85-6409-4d3c-922c-c253db6d2a1e/where_is_fear_the_walking_dead_filme.pdf
    • https://uploads.strikinglycdn.com/files/f33ff6b8-9350-48ba-ba45-760564ae8c69/49442083789.pdf
    • https://uploads.strikinglycdn.com/files/56cb3e8c-6df7-458e-9d7f-f5af98fb961a/matiposutovobu.pdf
    • https://s3.amazonaws.com/pazifetanegapu/ordinary_annuity_solved_problems.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_off0000e1db.bin
0aa9a0a0214588cb847ba1a20decabecbf0726db1ec28b323880d19eee18898a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 5160 bytes
font_01_sfnt_off0000f376.bin
e1d68291ab863c27c988649127d34c4227f66c7fe215f09a606deeada824bb58
pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 10568 bytes