Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d660890a0caf9da…

MALICIOUS

PDF

76.8 KB Created: 2021-03-12 08:29:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d479718b0fc3093661c8e02d33e4fdb7 SHA-1: 7a1f41400c8ae54f2dba490fe938600f87e63d2c SHA-256: 2d660890a0caf9dadba949a6505208f9c46276f86d8743a76cfecc52ff4b4eca
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm designed to distribute malicious content. It also contains an embedded URI pointing to a phishing-like URL. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=online+application+form+for+senior+citizen+card
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/2607812.pdf
    • https://bebabigi.weebly.com/uploads/1/3/5/9/135977904/3501300.pdf
    • https://baneboveboxov.weebly.com/uploads/1/3/0/7/130775782/6acf2901da5c9.pdf
    • https://paxepogemikut.weebly.com/uploads/1/3/5/3/135316128/levibikibej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/paxuvagal/tolizojatawaduxopa.pdf
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_516af2a0321b4ab38437072b3715400f.pdf?index=true
    • https://s3.amazonaws.com/vezumobigodub/sijuwuxavufopoburozudadu.pdf
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_20109b2bd6fb442cbecd1ff0073b8650.pdf?index=true
    • https://s3.amazonaws.com/divexikav/platformio_add_include_path.pdf
    • https://s3.amazonaws.com/guxosa/percy_jacksons_greek_heroes_quiz.pdf
    • https://s3.amazonaws.com/kavalukato/dirty_riddles_to_solve_with_answers.pdf
    • https://s3.amazonaws.com/fekaduvopigab/24114225406.pdf
    • https://s3.amazonaws.com/wefadep/wujuvaxawomebogumi.pdf
    • https://s3.amazonaws.com/senodiw/chinese_history.pdf
    • https://s3.amazonaws.com/sobaketemu/mutigadedobelo.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/mister_bechara_movie_song.pdf
    • https://s3.amazonaws.com/potamotaz/answers_pet_food.pdf
    • https://s3.amazonaws.com/luropi/jifadinevab.pdf
    • https://s3.amazonaws.com/tiluwisulepam/disputes_on_my_credit_report.pdf
    • https://s3.amazonaws.com/niporofez/the_raven_remastered_ps4_controls.pdf
    • https://s3.amazonaws.com/rujimidujek/kt_performance_blister_treatment_patch.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee1.bin
fb08fcdb0b45e895ed2333645595626199f36fe76e23632517f56ba5b6f8c05c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE1 5380 bytes
font_01_sfnt_off0001011b.bin
1b0ad0d36e0c244e2504d6eb77e210d31f7e40f4713a573239cf0f92b7aa0a1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 10656 bytes

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