Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e95f0e6768924b6…

MALICIOUS

PDF

88.7 KB Created: 2021-04-03 06:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 11c4b6edd93d98c13e51cc072fddf5cc SHA-1: 80a6dc502a880cde331d53ce3d5dccbea8ee187c SHA-256: 8e95f0e6768924b60a5771b5d70b3d1d209374e2bde220071bc0143e58e02fd4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/strik?utm_term=what+rhetorical+features+are+used+in+the+preamble PDF link annotation
    • http://nigemutekilum.mypressonline.com/79497885272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457861/normal_6054f62928022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468871/normal_606292b5cf397.pdfIn PDF document text
    • http://godezigupo.mywebcommunity.org/sotunadekuda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367013/normal_5fe3b9555ad57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428038/normal_6006b2f44b4c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484143/normal_5fcaef33b0249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460694/normal_5fdc5efec7f09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411686/normal_602dad81b9115.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464702/normal_5fd08feacf2fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_604cc130ac582.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
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_635ff5a62a6e498bbc0d0be43627a706.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pidufozu/feminist_epistemology_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/xokosonunaviv.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/91299310394.pdfIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_ce94e7efb2de41f3b122bfc80e1b75af.pdf?index=trueIn PDF document text
    • http://womawujun.atwebpages.com/accounting_journal_entries_ledger_and_trial_balance.pdfIn PDF document text
    • http://rovizomaguwex.atwebpages.com/carnatic_ragas_in_western_notes.pdfIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_43f0e667600144d1a3abeb22c4b0fa70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusori/dubirixovuduputukakeja.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B3 5432 bytes
SHA-256: cbeb895f852d3b7323864ce9203cafb68f6247c2795c8bf9a29bda1b33b643e7
font_01_sfnt_off000114fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 2712 bytes
SHA-256: 91b30a899099686a67d34aa8118b764fa0dc3eb98bd3f92bd6ab2847021f6c10
font_02_sfnt_off00012044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12044 11212 bytes
SHA-256: 0dc33dae0d709eee5cfeb3fc2aaa012dcb9c3d4455c4b66243f7d1b41c8c70a7
font_03_sfnt_off00014674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14674 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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