Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1d4940ffdc5dc2…

MALICIOUS

PDF

69.1 KB Created: 2020-11-24 21:03:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de95d772ff00413b31f88454270a9e5a SHA-1: 1b694ae0ec9ba71a6c563cdb148e3ca064028cb2 SHA-256: 9b1d4940ffdc5dc2812b86054326921e963f7e124acf29624ed0b57b186f89c3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, indicating a link farm or distribution mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=british+car+brands+logos
    • https://cdn-cms.f-static.net/uploads/4426957/normal_5f9b4735c108b.pdf
    • https://suzagosezamonu.weebly.com/uploads/1/3/4/4/134446802/penerojipes-sovetat-zewila-noxolekavi.pdf
    • https://xifamosavujefiv.weebly.com/uploads/1/3/4/4/134457952/b34dbb1.pdf
    • https://cdn-cms.f-static.net/uploads/4450345/normal_5fa1b2edd4305.pdf
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f91d422dbfe1.pdf
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5f8ebf51da103.pdf
    • https://cdn-cms.f-static.net/uploads/4447263/normal_5fa41320c47ee.pdf
    • https://cdn-cms.f-static.net/uploads/4421056/normal_5fa7491598a45.pdf
    • https://cdn-cms.f-static.net/uploads/4450045/normal_5fa5569faaba4.pdf
    • https://cdn-cms.f-static.net/uploads/4443594/normal_5fb36ddfda867.pdf
    • https://cdn-cms.f-static.net/uploads/4390663/normal_5fbc066d2ce68.pdf
    • https://cdn-cms.f-static.net/uploads/4460473/normal_5fbbec794ce71.pdf
    • https://cdn-cms.f-static.net/uploads/4411700/normal_5fb37f404f4d1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d097.bin
9e302774751fc81b5fba74385678c3a2a2006a0b88e7950ab00f5f2c4a120bac
pdf-font-stream PDF embedded font (sfnt) at offset 0xD097 5388 bytes
font_01_sfnt_off0000e2e4.bin
c94ee4aab6be54628865e8c66682b85a5226b126e1c347bf33663c8fdecea52c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 10916 bytes