Malicious PDF — malware analysis report

Static analysis result for SHA-256 3faecf100ddb1ce4…

MALICIOUS

PDF

73.5 KB Created: 2020-12-31 09:12:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f723f86e902dad443e7e9768279c490e SHA-1: d62246567fd986ff6f17de0e99c90af3053f7052 SHA-256: 3faecf100ddb1ce4359e05caf13688e64cc6801eeb764eec600910c2d3e8714b
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one critical link to a known malicious redirector. This indicates a link farm or SEO spamming operation designed to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=minecraft+story+mode+mod+apk+obb In PDF document text
    • https://cdn-cms.f-static.net/uploads/4473379/normal_5fbe698015267.pdfIn PDF document text
    • https://kilekofizinovi.weebly.com/uploads/1/3/3/9/133997912/1002955.pdfIn PDF document text
    • https://xizirogubo.weebly.com/uploads/1/3/0/7/130776043/492376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_5fc25bbf94873.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368955/normal_5fed24e29968f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_5fd85ba88e755.pdfIn PDF document text
    • https://gonalibage.weebly.com/uploads/1/3/4/6/134652093/rojukoguwakorava.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/AheOhbx/40598517899.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/tubelidul_davewupuvib_nivokipixaza.pdfIn PDF document text
    • https://cdn.sqhk.co/xakatikakizi/4hi40N8/business_plan_template_for_clothing_line.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410986/normal_5fe9977f1c080.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb66b1f-7992-4ec7-88f5-4cf72580e26b/41893286313.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AE 5580 bytes
SHA-256: 4e0b7b9f95d0c8c304cce45d000633a6769bf863f0b5e889a2289e53fdbe9a27
font_01_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 10648 bytes
SHA-256: 2b217ffbf260859fcf22d2b2977235f24b350c5573ac7c0f777c631bdec21f05

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