Malicious PDF — malware analysis report

Static analysis result for SHA-256 6775b3a33a276f46…

MALICIOUS

PDF

67.8 KB Created: 2020-11-18 08:57:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 362cfb6fdf48729506fff899c292b6ee SHA-1: 22dd6071613ea499cc22c078327ef54871d09447 SHA-256: 6775b3a33a276f46822429de08e2646bb45f118763a28e19bb8758ac0768314b
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-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://traffine.ru/strik?utm_term=chess+pieces+3d+models+free PDF link annotation
    • https://muropezevoride.weebly.com/uploads/1/3/4/5/134514904/95df1715.pdfIn PDF document text
    • https://gugozakeku.weebly.com/uploads/1/3/4/5/134588211/tofixinonerajufib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370059/normal_5fa380d588641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5fb2ba2263cb7.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/fa5e6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425224/normal_5faf275c6558c.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/wowabaxisefidet-nikuvajekibesim-napoxalapa.pdfIn PDF document text
    • https://mejodulifewu.weebly.com/uploads/1/3/4/5/134526208/xoredizolalaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459468/normal_5fad9c1753ad7.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/4ec60da3-af89-48aa-93cd-0818bc4db26d/tongeren_belgium_crime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac15d0d6-d7a9-4f42-a5f0-1126062601d6/68613302875.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/4486697046.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_off0000cb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9A 5252 bytes
SHA-256: 9d0398dc01be733bf40ff88e48432fe17880f08c66b9aa4fa58e85393f872009
font_01_sfnt_off0000dd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4D 11412 bytes
SHA-256: 10a9e0a17a2fed47f22193ceb82a63381a8e80f9526e68bc04236cb34427c77d

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