Malicious PDF — malware analysis report

Static analysis result for SHA-256 6722a5647095087b…

MALICIOUS

PDF

77.2 KB Created: 2021-01-03 04:11:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5d2ae75acd79287bea1f8335295a5cd6 SHA-1: 711436e06136b124db58b1a883f1c04de51325dd SHA-256: 6722a5647095087b2dbac62918c5bcce50d4b44fdf2762e011f3317032ddff1f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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
  • 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.
  • 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/aws?utm_term=adductor+muscle+exercises+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454306/normal_5fd77ac50bf75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_5f8c2ab2b0026.pdfIn PDF document text
    • https://wovebisaji.weebly.com/uploads/1/3/4/6/134687394/2314116.pdfIn PDF document text
    • https://nebelifufenav.weebly.com/uploads/1/3/1/4/131437331/deboborerojunisot.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/90e15a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_5f9f03b09751f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370777/normal_5fe261ac90b07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453551/normal_5fe904004b566.pdfIn PDF document text
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/wopujemufonaxeboz.pdfIn PDF document text
    • https://rafulosuzeme.weebly.com/uploads/1/3/4/2/134234553/7607736.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ad7d6a46-abe6-494a-a77b-98402fc9190c/980761716.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D3 4924 bytes
SHA-256: 39b6e90b45e73f456e0e975bf75b0422ef66013c9007f4f8e184252c19fb1b51
font_01_sfnt_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 10504 bytes
SHA-256: 0e5bf81d4ac160ebef632e4279562e0c05abb800a050303a5f22da1d82e87783
font_02_sfnt_off00011a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A12 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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