Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c01d6655fd68bc4…

MALICIOUS

PDF

85.9 KB Created: 2021-04-19 19:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 96116f64bcc06055bf0793a57c050dd0 SHA-1: 1d557289b5a299775e575bebcb1c846232e34c9b SHA-256: 3c01d6655fd68bc4626bc84dc0acdc8f42981ff4ad2cf9af2585349d4d63c130
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is part of a link farm, potentially for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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=alkaline+diet+recipes+for+dogs PDF link annotation
    • http://varietystore.website/xopuvudaxabuloke5ece3.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/vogaxaxekem.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/h5eOgjZ/58454913906.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/13rjeji/british_council_general_reading_test.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/is_there_a_book_9_of_outlander.pdfIn PDF document text
    • http://prodson.space/seevoice_free_voice_chat_rooms_downloadu8mub.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/8icSMH9/chess_pieces_values_points.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/f6EniiC/fixakiweliveratagesiva.pdfIn PDF document text
    • http://rerubin.space/77903352947qkx54.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/NgcShhQ/guess_the_movie_answers_roblox.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/pugezavepope.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/zenimibimomatuwujivibe.pdfIn PDF document text
    • http://iranianvc.com/east_of_eden_book_review_new_york_timeskhbia.pdfIn PDF document text
    • https://cdn.sqhk.co/pewowutefiw/rjiifbc/iot_architecture_layers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_f70c479a88864256a68d8966bcc6c639.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_30f5c9c5b5514566bd9aaa97b6422f33.pdf?index=trueIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_32a5c795533044a19d1dd0debbe3cbdd.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_off0001107d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 5376 bytes
SHA-256: 3b2b6e2a26da09fab7097488bcb3a31f19b1c7f2bbb72b3aafd3a1aa7722e1e8
font_01_sfnt_off000122da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DA 11876 bytes
SHA-256: 1b714cd998054062311921ac039bd70b9815ac5dec7a9d6f371b3106f4fe102d

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