Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce929ece13f0c31…

MALICIOUS

PDF

61.2 KB Created: 2020-11-11 22:49:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0de8ff7dcf8f98e871cf00e10fcd5385 SHA-1: d7a5567fa65db2a052a94ecdf78a574e3a91e614 SHA-256: 4ce929ece13f0c316f06d98599c7091129ac379bc9f1931102a10457f58d6757
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'traffmen.ru'. It also exhibits characteristics of a PDF link farm, with numerous external links, including one pointing to 's3.amazonaws.com/jepinebawo/91768784488.pdf'. The ML classifier strongly indicates maliciousness, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://traffmen.ru/123?utm_term=nuclear+engineer+salary+navy
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f91464a6a0c9.pdf
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f9e3c370e480.pdf
    • https://cdn-cms.f-static.net/uploads/4387716/normal_5fa428b5d0834.pdf
    • https://cdn-cms.f-static.net/uploads/4408984/normal_5f9ca1ebacefb.pdf
    • https://wirukibit.weebly.com/uploads/1/3/0/9/130969322/jejiwapujolare.pdf
    • https://cdn-cms.f-static.net/uploads/4374376/normal_5f9488b598ecb.pdf
    • https://debemalimuwu.weebly.com/uploads/1/3/4/3/134385929/751e13f848.pdf
    • https://cdn-cms.f-static.net/uploads/4421342/normal_5fa5477c63357.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jepinebawo/91768784488.pdf
    • https://s3.amazonaws.com/widiku/drug_metabolism_book.pdf
    • https://s3.amazonaws.com/vatosolikijike/pickerington_local_schools_infinite_campus.pdf
    • https://s3.amazonaws.com/medadele/tokevefavuwe.pdf
    • https://s3.amazonaws.com/fosagobomap/arabic_translation_to_english.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_off0000b352.bin
8dc29994fb6c34927c0b079d25964b279b95a25e1e08fb6d84b357552fb098d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xB352 5100 bytes
font_01_sfnt_off0000c4d1.bin
e89936081cd6e2fddd43f587518303fd3c8261db865ff0646b927eeee97341cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D1 10308 bytes