Malicious PDF — malware analysis report

Static analysis result for SHA-256 7744a5492d5e7b97…

MALICIOUS

PDF

92.4 KB Created: 2020-12-25 23:44:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c9f3b42617debbf4a8f802899c27b97 SHA-1: 14cce95c2ca5c69d1d58ec81624540a6ad6a3edc SHA-256: 7744a5492d5e7b9790e4d9d696d96b42cf2cdcb3ca121f7893f8362dd8537a59
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a phishing or malware distribution attempt. The primary external URL, 'https://trafffe.ru/strik?utm_term=dancing+line+2.+7.+30.+00', is a strong indicator of malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure and URL farm point towards a malicious document designed to redirect users to potentially harmful sites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=dancing+line+2.+7.+30.+00
    • https://cdn-cms.f-static.net/uploads/4381976/normal_5f95e01123870.pdf
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/9accf2be34380a.pdf
    • https://cdn-cms.f-static.net/uploads/4410190/normal_5fc2461789c51.pdf
    • https://wimavebitajiki.weebly.com/uploads/1/3/4/6/134609796/ligezoso-sijegutowo-rekif.pdf
    • https://static.s123-cdn-static.com/uploads/4365613/normal_5fddfb98a416e.pdf
    • https://movamapipimopi.weebly.com/uploads/1/3/5/3/135303402/9096191.pdf
    • https://cdn-cms.f-static.net/uploads/4408177/normal_5fabb4779d675.pdf
    • https://cdn-cms.f-static.net/uploads/4409092/normal_5fa0e402ee970.pdf
    • https://cdn.sqhk.co/tiwumixe/hfSVPhf/22553791132.pdf
    • https://static.s123-cdn-static.com/uploads/4416322/normal_5fd06a3cd72d9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wurivuve/what_s_on_tonight_brisbane_tv_guide.pdf
    • https://s3.amazonaws.com/fizaxo/47536575273.pdf
    • https://s3.amazonaws.com/gogoxowiniza/google_account_manager_7._0_apk_2019.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013672.bin
2fe39ec5406be38a660e659043136679688f5115b6687aff2f21f339ce06144f
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13672 25680 bytes
font_00_sfnt_off0000fed3.bin
1edc1eba3745ec489b5762497f969a66201cf08b5667c89e0952c2969962fc7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFED3 5240 bytes
font_01_sfnt_off000110d1.bin
770936fecaf7b310d3c062a8a0bfbc9b27d226374621d8cb5102e3d024e75952
pdf-font-stream PDF embedded font (sfnt) at offset 0x110D1 10968 bytes