Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a0d5692830d888…

MALICIOUS

PDF

78.6 KB Created: 2021-03-24 06:13:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4afbdb93fb1bf570eaef8f2f40726fd8 SHA-1: 7328455071e2a410299c76f0695652f2937b64c1 SHA-256: c6a0d5692830d888b886a07df7bbee360691bdcf5098cfb675d5d2a1df09110d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=best+d%2526d+5e+books+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468289/normal_60223aa5a8405.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481162/normal_600844cb1a765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450724/normal_6054fa03ad2c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463554/normal_603be1ae4b226.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392462/normal_5ffadfd3292a2.pdfIn PDF document text
    • http://gratoraama.website/1754921867851hjg.pdfIn PDF document text
    • http://stopnutristrike.ru/boy_scout_merit_badge_sash_pinhexm9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424682/normal_5fc732fd2578a.pdfIn PDF document text
    • http://bullbananavannaone.xyz/contract_lawyer_chicagoy4woh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475992/normal_60417b002e828.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://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_81ab675eae964cb28c196656269317ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/memexelu/brooklyn_nine_nine_season_4_episodes.pdfIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_a589f0dd417a4397a33a398258d4a516.pdf?index=trueIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_fc409297e6d44ec1980ccda53198b77f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wifukedot/what_is_the_lesson_of_the_cask_of_amontillado.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/jugexikixe.pdfIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_8c48a78e8502402da7177692dca069ec.pdf?index=trueIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_58bfd618359c485894dacf6aaeacf4aa.pdf?index=trueIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_e667a8febd9b4480ac374b92c51d4934.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED23 4052 bytes
SHA-256: 629dccfb4c41757ba986f7e37a9452d0ddd2fad49fbcf321e1b63bfcef46e9bc
font_01_sfnt_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 10612 bytes
SHA-256: 69076018ea486b1165a79e3903fa01e78b1cd9ce09baad35b154e047cf6fc90a
font_02_sfnt_off00011f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F39 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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