Malicious PDF — malware analysis report

Static analysis result for SHA-256 a669223769ecf292…

MALICIOUS

PDF

84.9 KB Created: 2021-01-09 07:39:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9293005679dd8d099033ee97316f5a1 SHA-1: 546090c97a37d5f415a7d43b3ae170cbe8c293a9 SHA-256: a669223769ecf292500a6e9c3069a73932467dedb9bf4b4e91a735812de699a5
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The file contains a large number of embedded URLs, forming a link farm, which is a common technique for phishing or SEO manipulation. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/123?utm_term=best+cities+skylines+dlc+2020
    • https://cdn-cms.f-static.net/uploads/4404310/normal_5fa2d898737c3.pdf
    • https://zujamabosav.weebly.com/uploads/1/3/4/3/134363941/9757711.pdf
    • https://cdn-cms.f-static.net/uploads/4465703/normal_5fa9a2b8ac1c9.pdf
    • https://cdn-cms.f-static.net/uploads/4458848/normal_5faa57991892e.pdf
    • https://gozaperirij.weebly.com/uploads/1/3/1/1/131163841/gigusowijudimebamuro.pdf
    • https://cdn-cms.f-static.net/uploads/4420747/normal_5fa9c6193b443.pdf
    • https://faworufobideped.weebly.com/uploads/1/3/2/6/132682851/1cd8079e5c5b1f.pdf
    • https://cdn-cms.f-static.net/uploads/4420610/normal_5f9bab090e96a.pdf
    • https://cdn-cms.f-static.net/uploads/4412173/normal_5fd938381b155.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wisatutadi/92723736386.pdf
    • https://s3.amazonaws.com/sojebelevenex/business_ethics_now_ghillyer.pdf
    • https://uploads.strikinglycdn.com/files/e8e04047-e153-400b-bd43-86457d4c6195/viwugoj.pdf
    • https://uploads.strikinglycdn.com/files/41c72da2-dd56-4b0f-9b7f-cb0246dd78a3/samsung_hu8550_manual.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_off00010dd1.bin
b2110306fb28bc0c9ac6127f5a70b9cab9fb0273418f8d3b36665ef6e505dd3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 5116 bytes
font_01_sfnt_off00011f65.bin
98fc9189257362546803abea1a454a6474ed55e9f05a0adf56629746542a9f0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F65 12184 bytes