Malicious PDF — malware analysis report

Static analysis result for SHA-256 49fdb0e7591f3666…

MALICIOUS

PDF

74.5 KB Created: 2021-04-14 09:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a902b3feeda277ae9ba55d3608fa4c2 SHA-1: 64d69a99545431ff4fc32612100d4c7ba0aa13e0 SHA-256: 49fdb0e7591f366623cb5a77ff2ba06e7eedf16301e35097b050d49e8b53b1c7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=plant+physiology+and+development+sixth+edition+pdf+free+download
    • https://cdn.sqhk.co/puxitika/ggiAjef/encyclopedia_dramatica_offended_challenge.pdf
    • http://dle-tpl.site/jarajofodixpkp3y.pdf
    • https://cdn.sqhk.co/xapawavuma/hibb1jg/fast_colors_movie_cast.pdf
    • http://zofunubesosena.mypressonline.com/chava_marathi_book_free.pdf
    • https://cdn.sqhk.co/fezifoxunif/hDgjNii/introduction_to_business_management_questions_and_answers.pdf
    • http://lofoporubatul.mygamesonline.org/35991793626.pdf
    • https://cdn.sqhk.co/jipodipotaj/wHHwhcF/pinball_cadet_controls.pdf
    • https://cdn.sqhk.co/wexovezojab/Zovjeic/54804153935.pdf
    • http://reduslimitaly.website/95488293884k0kd8.pdf
    • https://cdn.sqhk.co/zamokaxu/jgh5Ymg/theatres_yakima_washington.pdf
    • http://sugalomiwuto.getenjoyment.net/caia_level_2.pdf
    • https://cdn.sqhk.co/nezafomura/7pigidC/67682975858.pdf
    • http://freshnatur.fun/921097521866p6uu.pdf
    • https://cdn.sqhk.co/zibomevuguli/hj7ieb2/18771825524.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_2ceb11672b0f4df7af8f1a6a9b62b767.pdf?index=true
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_4d02e21e0fe54568b76f3cd96e894379.pdf?index=true
    • http://lugimeviguv.myartsonline.com/convert_to_word_document_that_can_be_edited.pdf
    • https://997b2cc2-d96d-4654-b184-8a5d7ad473c0.filesusr.com/ugd/b8d08c_59d43b4306c249a2b7fc5e9a6c591ea3.pdf?index=true
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_afa5455064b24745834263801848c76f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/02c4053a-2aa2-475e-9f35-f5c4efb895e7/how_to_be_freelance_proofreader.pdf
    • https://uploads.strikinglycdn.com/files/d1bd9c77-a237-4c4b-ad05-3372aeea8296/what_is_free_flowing_brown_sugar.pdf
    • https://uploads.strikinglycdn.com/files/0290d7d7-7ef8-444d-877f-fff2d502e385/how_to_use_my_bissell_proheat_pet_carpet_cleaner.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_off0000e53e.bin
5b21a97df861c5725ddeb3c336d73145dc26e2d5ed78a533a69b26db3ba1d6b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE53E 5780 bytes
font_01_sfnt_off0000f8e4.bin
6432bea7acb78d7daadf3c72c97aa978dfea5363226160b2ceed5eae36432cfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 10316 bytes

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