Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1d9bf337ab5623…

MALICIOUS

PDF

66.4 KB Created: 2020-11-26 06:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 626f4eb8df95decaaefa47e882993cb8 SHA-1: 7b1f453d19aad0349291321d534fb78bf842cdb8 SHA-256: 8a1d9bf337ab56232b46d9a4c103d9a245b1b26cb94553ec9a5e641beb8db897
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary URL pointing to 'traffking.ru'. This URL is likely used to host a phishing page or distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classifying it as a phishing trojan. The PDF structure itself, with a large number of external links, suggests a link farm or SEO poisoning attempt to drive traffic to malicious 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://traffking.ru/strik?utm_term=dead+and+gone+book
    • https://cdn-cms.f-static.net/uploads/4482854/normal_5fae9de0455b8.pdf
    • https://cdn-cms.f-static.net/uploads/4413345/normal_5f9ecbbc2cf53.pdf
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/juribixituvebipojif.pdf
    • https://kukevukoleguko.weebly.com/uploads/1/3/4/2/134265740/9176923.pdf
    • https://cdn-cms.f-static.net/uploads/4415334/normal_5fafdcad1e9aa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/478bd6ca-61ef-4853-bc73-00d2eafb055d/skyrim_a_la_recherche_dune_rvlation.pdf
    • https://s3.amazonaws.com/pusori/werewolf_transformation_audio.pdf
    • https://uploads.strikinglycdn.com/files/86117153-00b6-4744-acc7-4085447a321a/84543949521.pdf
    • https://s3.amazonaws.com/dogazisuze/mefelimapamur.pdf
    • https://s3.amazonaws.com/dutimajizowa/47948378005.pdf
    • https://s3.amazonaws.com/xarojapi/2802226946.pdf
    • https://uploads.strikinglycdn.com/files/b65228dc-c3c9-48ee-a1bf-64f84af6bbcf/29853861316.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_off0000c91d.bin
4d18645db89edef301d6d7b487f8e023e8a2c747c37671ca9f1c1d6345e05671
pdf-font-stream PDF embedded font (sfnt) at offset 0xC91D 4888 bytes
font_01_sfnt_off0000d9de.bin
ce1868846569806bf38bd8a91019fa3bfaccd82f0b1e8c5d1fb35bb486e73d37
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 10408 bytes