Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e4becfce207f04…

MALICIOUS

PDF

71.1 KB Created: 2020-12-28 18:55:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a30c1d1a3a2a2bfdd1230489dc38ceeb SHA-1: 10109f0dd753cc73231c83501186144b03bbdda0 SHA-256: f5e4becfce207f04ea37bc0a93ba8834461b184155a68dcb834229a9ac1e5770
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=mighty+bomb+jack+nes+cheats PDF link annotation
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/nuzobe.pdfIn PDF document text
    • https://dujizajep.weebly.com/uploads/1/3/4/7/134704211/xozoba_lazizadapoji_musonore.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/gjifjhk/syberia_3_xbox_one_allegro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_5f8cbb318bb00.pdfIn PDF document text
    • https://lodokevez.weebly.com/uploads/1/3/4/4/134476034/3509221.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/gijderC/ronibakuguwi.pdfIn PDF document text
    • https://sesesisemiv.weebly.com/uploads/1/3/4/7/134746737/a52db75b.pdfIn PDF document text
    • https://waxusebodik.weebly.com/uploads/1/3/4/5/134529962/demeg-ferulov.pdfIn PDF document text
    • https://cdn.sqhk.co/niturunajik/ghhN7jg/83053358129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f9d04aed4597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448126/normal_5f9db54b3fd38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387224/normal_5f99b195d9d0f.pdfIn PDF document text
    • https://gogozugibijom.weebly.com/uploads/1/3/4/3/134369614/cf04d6f3f84b6be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_5f990a1851312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_5f9bae6134fe5.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
    • 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_off0000ca89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA89 5260 bytes
SHA-256: 7ec967b56b77c890ce53f9d68ca04a0bc0998b4b04eca1593746e450552485f0
font_01_sfnt_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 11104 bytes
SHA-256: da64f76f8f38d90515c991937195e991e0ad5c6abfa76f6e84bbb4d0f2085521
font_02_sfnt_off00010190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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