Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b98b2d515bd7645…

MALICIOUS

PDF

68.6 KB Created: 2020-12-21 05:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c5711e5eaaf1250865b26c13bffb8b4c SHA-1: bc0530a841cde40466ab929def9ad4373d4cd78e SHA-256: 6b98b2d515bd7645b6b3f4ecbb361f367b6af22d5b8788d4b4011a647589cb74
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious sites, likely for malware distribution or credential harvesting.

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://traffine.ru/strik?utm_term=wall+street+zombies+in+zombie+highway+2 PDF link annotation
    • https://devumevone.weebly.com/uploads/1/3/4/5/134589636/kudajolijati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_5fa0c77543667.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373782/normal_5fe00ad2e9110.pdfIn PDF document text
    • https://xonadenot.weebly.com/uploads/1/3/4/6/134685596/2894324.pdfIn PDF document text
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/7771711.pdfIn PDF document text
    • https://nekegofoka.weebly.com/uploads/1/3/4/3/134364724/lexoritisuzew_golifogusubirer_seposaxixosa_jusunaviz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470540/normal_5fdb760e5a9ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5fcc229523f98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_5f906bf44787c.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/rasitavulaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/moramorowenexego.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/automatic_control_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddfbe7ab-25bb-4b83-80df-f483b01f28f2/53640692850.pdfIn PDF document text
    • https://play.google.com/store/apps/details?id=com.auxIn 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_off0000cdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFC 5628 bytes
SHA-256: f9b1e76f9872f08446eec97a95619b1b11db9b19754c0d210a763825b4f0c8fb
font_01_sfnt_off0000e120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE120 10932 bytes
SHA-256: c4e77a0dc37d18a0380ae393dd463a36dfd1c4e0af6768444104e3cc6c4353e3

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