Malicious PDF — malware analysis report

Static analysis result for SHA-256 6861999fdc724e88…

MALICIOUS

PDF

85.5 KB Created: 2021-05-12 22:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f36e8b1f8672d16c43d880177a040de4 SHA-1: dd95a6c85f9733ed869b91cbdc220c583e5ca83b SHA-256: 6861999fdc724e88d0088c0a1cefb1f452edf3f5d9856ea64d47efd96f00feda
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://xezojetit.ru/strik?utm_term=navy+blue+jacket+sailor+of+the+quarter PDF link annotation
    • http://blablablacar.online/7251660922lfaz7.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/hnjfuge/kick_horse_river_rafting.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/how_to_study_for_drivers_ed6txxu.pdfIn PDF document text
    • https://pejilajapife.weebly.com/uploads/1/3/4/4/134477767/pubepaleviso.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/cHidMif/2087806428.pdfIn PDF document text
    • https://jekotufuwin.weebly.com/uploads/1/3/1/4/131406020/zutamemuwuxegazuze.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/jrjghdz/tisafatoxomase.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/63a9c134-e714-4321-9c53-7a0aa223d351/pewitoduxubotumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63bab383-0573-4599-a7e0-f3f6808b4036/robert_anton_wilson.pdfIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_b522ff2f16dc4d4890f05e098b793e34.pdf?index=trueIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_1d9e2a6144144a8db5fafd26869993b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8958434-4431-46ad-b99f-f253e5f88b66/reiki_symbols_images.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/box_office_movies_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/bumogog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b151f41a-ba1e-49c4-a718-18211c0952f8/62946409456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c88a1f15-a5bd-4561-8611-d20d1d5f6a03/68748024158.pdfIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_43dd900b9a994958842827ab2556302b.pdf?index=trueIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_935493d9137844a6af665ab61b03e9d0.pdf?index=trueIn 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_off00011123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11123 5504 bytes
SHA-256: 9611f254c8209eb54760d810d1298689b5ad72fc5fd5ddfdf4b486e86be25fb2
font_01_sfnt_off000123f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 11036 bytes
SHA-256: 6319b26599843cb3e98ed61c68edca66215eb87220ad1639edfc668642bf0f61

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