Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8db25cd31ea5b05…

MALICIOUS

PDF

98.5 KB Created: 2021-04-02 22:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c2c55d4ec3c9de0bde87c28f1ab87503 SHA-1: d001b906fe9136abc433fbf5f4257d89c492f709 SHA-256: d8db25cd31ea5b050076d77bd6a61b1ef54480b0258e3100b390009e1ed8263c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, appears to contain metadata related to a document title, likely intended to mask the malicious links.

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://jottigo.ru/strik?utm_term=chapter+7+section+5+the+congress+of+vienna+members+and+representatives PDF link annotation
    • https://cdn.sqhk.co/zesojesiwi/eii8ghG/skee_ball_plus_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/giripiponi/R6hjjhb/befixusifafapos.pdfIn PDF document text
    • http://coins24h.com/17187546985xard9.pdfIn PDF document text
    • http://uspeh.icu/7807542842d28k8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457560/normal_603185257060d.pdfIn PDF document text
    • https://cdn.sqhk.co/ribegibonot/PUoPhjt/paris_texas_zip_code_map.pdfIn PDF document text
    • https://walinakonefal.weebly.com/uploads/1/3/4/3/134316097/vilojapogalomub.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/gejog.pdfIn PDF document text
    • http://stonersfranchise.com/wilderness_survival_merit_badge_shelterg795c.pdfIn PDF document text
    • https://zugowexilib.weebly.com/uploads/1/3/5/3/135349829/zuvegokoju.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/6675238.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484383/normal_5ff854d25e61d.pdfIn PDF document text
    • https://bofujobepoj.weebly.com/uploads/1/3/1/1/131164048/xoxogipisekes.pdfIn PDF document text
    • http://leree4.club/kazaxzyvgr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_cf729169e6f44776a49f9d6d02592721.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb345906-ed28-46c5-a131-ead5be0b2f46/leparedemabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f19f8df-d88f-41f6-866e-16f7bcda002c/how_can_planting_more_trees_help_to_reduce_climate_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e018b9d-6f5b-46fd-a05c-76256113eea5/puzogepodaborikerezifa.pdfIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_2aff25ca560a4772b788ed2a38a396a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eb56c57-f0af-42ad-ae4b-c8c767072e34/how_to_get_driving_records_online.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_off000142a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A1 5844 bytes
SHA-256: 413553296e5afbc50393f23d7b7f4b32e8d255386fc1cd5c556eba97fd17291f
font_01_sfnt_off00015669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15669 11632 bytes
SHA-256: e5558fb0837a88b23fa3f3b279c068c0eb51927f7b162079bcde4e6d707990df

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