Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c2643ee665c347…

MALICIOUS

PDF

73.2 KB Created: 2020-12-17 08:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fe544d10536051dd6ffd23f00092c8e SHA-1: 94ce98a7857dfcdbfc90e24949318dda00ea1b84 SHA-256: a7c2643ee665c347147820bf176c9b96c2b3bf58b0181d77dcebad64d9282893
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in phishing or SEO spam campaigns to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content, aligning with a phishing attack pattern.

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://trafficel.ru/strik?utm_term=ww1+british+uniform+painting+guide
    • https://cdn-cms.f-static.net/uploads/4369665/normal_5f9ca800c84b6.pdf
    • https://cdn-cms.f-static.net/uploads/4453720/normal_5fab174cf2269.pdf
    • https://pamuguvijokogag.weebly.com/uploads/1/3/4/8/134883264/545050.pdf
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/be6f4374e.pdf
    • https://cdn-cms.f-static.net/uploads/4420592/normal_5fbc7c7db7e93.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/191ecf39-260a-433a-85d0-9e7019bfb1b3/army_sub_hand_receipt_form_2062.pdf
    • https://uploads.strikinglycdn.com/files/ec0d673a-9e0f-45f3-b3ee-091f44fa0e3c/lama_qui_sourit.pdf
    • https://s3.amazonaws.com/vokeri/yahoo_mail_not_working_in_chrome.pdf
    • https://uploads.strikinglycdn.com/files/a0f66d18-813c-4993-a656-637b9478f74e/66_ford_fairlane_gt_hot_wheels.pdf
    • https://uploads.strikinglycdn.com/files/7f28d938-7960-4f63-a58d-91a5e5ff413b/56649647494.pdf
    • https://uploads.strikinglycdn.com/files/bd50393a-5618-4837-a10e-3d320b29876b/1000ml_oz_water_bottle.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_off0000df89.bin
537670346959e4ffaa74015a5e8ee198f093f9886db49f1458a3eeca8a13eeb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 5720 bytes
font_01_sfnt_off0000f2f3.bin
ec4841d92821f1bc5e435ccbba4652bf9d03418ed4b4f9e89b54b60f4b77e3c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F3 10812 bytes