Malicious PDF — malware analysis report

Static analysis result for SHA-256 205ad6392bea5366…

MALICIOUS

PDF

75.9 KB Created: 2021-05-11 06:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 320332e474579f307a13fc94a0a3ee7a SHA-1: e8ab05a17794ec936c19b5ab009566e8b26f91ae SHA-256: 205ad6392bea53663ff3b058308b7d08926adc73028bf25a0db501ee22a879df
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'bologen.ru' and disguised with a search term related to camera setup. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, suggesting a campaign to distribute malicious content. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=canon+430ex+iii+rt+wireless+setup PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409246/normal_5fdb1b1d1b03f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379029/normal_602a75e862b8b.pdfIn PDF document text
    • https://lokurosafo.weebly.com/uploads/1/3/4/4/134479987/2437241.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476580/normal_5fddbf36450d8.pdfIn PDF document text
    • https://doxediseweroz.weebly.com/uploads/1/3/4/6/134634010/4272519.pdfIn PDF document text
    • https://nekamijej.weebly.com/uploads/1/3/4/6/134633096/3787441.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/redajusasodob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406497/normal_60461d1dd739c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443814/normal_5fcc920e80eb8.pdfIn PDF document text
    • http://lupaper.22web.org/ntn_pillow_block_bearing_catalogue.pdfIn PDF document text
    • https://pumebogevi.weebly.com/uploads/1/3/4/5/134583518/3548663.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dulubuli.rf.gd/mc_command_centre_guide.pdfIn PDF document text
    • http://residarifuwus.rf.gd/windows_10_updates_over_metered_connection.pdfIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_074fc9c04103431591d8a42a24b3c4ad.pdf?index=trueIn PDF document text
    • http://nakepusejedub.epizy.com/59978479608.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_5221ba8d718a441db8db9a89b4b5d68f.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_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 5272 bytes
SHA-256: 2624e77694015ad084ac1319430e47c35e610c62ab7db7669f265c4877efa9bc
font_01_sfnt_off0000f990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 11588 bytes
SHA-256: 496340e03510599dd057514155b3944687e4ff97fe8c9135a98e8c72d804fb66

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