Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d63062a4c23d55…

MALICIOUS

PDF

78.1 KB Created: 2021-03-29 08:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e55d712c653845e2d26fa17b9ddcbde1 SHA-1: 32ec3144f707786c94003a5101fa3325ceebad15 SHA-256: f1d63062a4c23d551c4673967766de0289a137742b04e603b58dda7c0566c0b8
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious nature of the document. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/award?keyword=pdf+aminoacidos+esenciales PDF link annotation
    • http://itasummer.fun/bokoxepesobuduzubufupvf7uo.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/84477506452skjlk.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/vjjsght/fan_at_the_game_crossword.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391898/normal_600a8a3d1697e.pdfIn PDF document text
    • https://mizavujubamu.weebly.com/uploads/1/3/0/7/130775062/mutuni-fuxesidafema-jebudipofir-vakizevexuwox.pdfIn PDF document text
    • https://cdn.sqhk.co/feduvefas/djcIifD/mevawifobizilegetewurifu.pdfIn PDF document text
    • https://cdn.sqhk.co/lagolipumepi/Uucghgg/23969201774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418777/normal_6012b095d6996.pdfIn PDF document text
    • http://esclub.pro/easy_fingerpicking_uke_songs4hlic.pdfIn PDF document text
    • http://sibuvre.com/best_rock_ballads_ever8m5ux.pdfIn PDF document text
    • http://tronreserve.online/4095957837wk1nv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411714/normal_60275c9bad116.pdfIn PDF document text
    • http://kindraretterath.com/large_george_foreman_grill_with_removable_platesgog3x.pdfIn PDF document text
    • https://fikazimibugexu.weebly.com/uploads/1/3/4/5/134515259/725158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408584/normal_6015fc2d0f151.pdfIn PDF document text
    • http://flowerport.shop/68326280143634p5.pdfIn PDF document text
    • http://alexsaf.ru/gepomolejb1j5.pdfIn PDF document text
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/xokiwikoxiluza.pdfIn PDF document text
    • https://godadonalizubo.weebly.com/uploads/1/3/1/4/131437317/laboxo.pdfIn PDF document text
    • http://ideal-it.fun/schaums_outline_calculusd9fw6.pdfIn PDF document text
    • https://bizevino.weebly.com/uploads/1/3/4/3/134320064/tonesafa_gefiteka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 5072 bytes
SHA-256: 1c6626cca5cad2794998c2de8c20b06752c29810316573ab356f1d078a8a1e09
font_01_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 11728 bytes
SHA-256: bf01827d6afa1ae732c6d55a5149b614eb0fbc5f3ac523620822b191cfbeab4b

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