Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8dc3fdc25a0a67…

MALICIOUS

PDF

91.0 KB Created: 2021-05-07 09:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 962b14c33b012257d00d4749f5d8aeb7 SHA-1: b7289a2548575ca90f20ae6770bafb95508df3fb SHA-256: ad8dc3fdc25a0a6763faaf8232021f204df804afa2648f0360a7d8caba74c8ce
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a high number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to paste content into a command-line interface, a common technique for executing malicious commands. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://zajinet.ru/strik?utm_term=c+for+dummies+ncurses PDF link annotation
    • http://jigapenufi.medianewsonline.com/jukosunesewobe.pdfIn PDF document text
    • http://gojepifega.22web.org/nakotosegagiki.pdfIn PDF document text
    • http://nomudepalak.medianewsonline.com/himno_al_maestro_salvadoreo_letra.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_6037d5f6a6605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462056/normal_6035fba6adcfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411918/normal_60651a6a96ec6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f5071db7-799c-4807-8cfa-c66b012f33b1.filesusr.com/ugd/9a4546_e93a0ff74e24470d98765d75c228ae2a.pdf?index=trueIn PDF document text
    • https://74bb8966-1fc2-43cb-a641-24c20f380d28.filesusr.com/ugd/84c7b5_c368ea9358b14a29971774544e769e99.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dotivaf/kitchenaid_coffee_grinder_repair.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/harry_potter_8th_book_online.pdfIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_7688f34c25314639a77ff372a5d8162f.pdf?index=trueIn PDF document text
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_2e7532dc8b2c48f6af68d97472a6921a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/movie_and_tv_show_apps_apk.pdfIn PDF document text
    • http://dopovis.myartsonline.com/jabisafagarer.pdfIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_36ed3096a37f420990376c4f62b8ebb5.pdf?index=trueIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_975246c6a4f14ea0a3feab650102f3f6.pdf?index=trueIn PDF document text
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_95f3988428994d41a2867ba5e5ac3df6.pdf?index=trueIn PDF document text
    • http://wibefiwijufet.epizy.com/rixikilegugezigedabiro.pdfIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_7728041f4c794c58a266e6651ab5d032.pdf?index=trueIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_9082ba1820ca4b189f2856b4ada5d2eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/vevakuboxapedusalijujurag.pdfIn PDF document text
    • http://nibemodida.myartsonline.com/xolifagup.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_off000126ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AC 4828 bytes
SHA-256: a4eb1afb46bf9f75ae17e154cca1e72af2f3c2f19399425641baf2fe588bee3e
font_01_sfnt_off00013704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13704 12036 bytes
SHA-256: 4c74bad490585f805acf9a19f550abac026ae622b561c5cdc2bb8d4fffbb9a0d

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