Malicious PDF — malware analysis report

Static analysis result for SHA-256 349deac04dcc450e…

MALICIOUS

PDF

82.9 KB Created: 2021-04-03 18:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b8a7a114d925458947ff88affabdccaf SHA-1: 58d7933d6ee00fe34e77c28a432efbdd6319f790 SHA-256: 349deac04dcc450ebe9d488520087181b2821609445ebd3f26b8bb5e54f6ad04
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary suspicious URL pointing to 'zajinet.ru'. Heuristics indicate this PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/award?keyword=financial+report+template+pdf PDF link annotation
    • https://cdn.sqhk.co/viwiratoposu/1gc7gdP/92288090874.pdfIn PDF document text
    • http://urologo.store/romeo_and_juliet_characters_and_motivations_chart4htmh.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/qhhjdp3/76366893178.pdfIn PDF document text
    • https://cdn.sqhk.co/xujurovemu/fSKhbhb/cancel_amazon_kindle_unlimited_free_trial.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/t7giggE/61327780557.pdfIn PDF document text
    • http://sevastopol.sale/architectural_presentation_sheet_layout_templatesxwez9.pdfIn PDF document text
    • http://fakts.design/61229703216vfgdr.pdfIn PDF document text
    • http://instapriz365.online/67842549347car8r.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/7y8iGie/power_bi_interview_questions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c61d3bac-26a0-4c75-b0a5-e00349bac852/nosudebafogekexibilej.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/gyri_of_the_cerebrum_are_formed_because.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/is_after_we_fell_going_to_be_a_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b19ed5af-183e-433a-8196-1c619559d1d2/tuben.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/how_to_fix_e7_error_on_air_conditioner.pdfIn PDF document text
    • http://loxometos.epizy.com/21842661537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cc139a4-3494-4f5a-8cb1-c85237043aab/tutorial_asp_net_mvc_5_espaol_viewer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c78acd-4b65-4838-9262-817af8316cf7/ritusefiduxewufatesivik.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/60736817986.pdfIn PDF document text
    • http://pikawin.rf.gd/his_dark_materials_episode_guide.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_off000108b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B7 5080 bytes
SHA-256: a5cd940431204d7134d98c967c769f62535abf6a0837bb887d423aa414fd965f
font_01_sfnt_off000119ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 10912 bytes
SHA-256: c573690e001056aacd24f572497cd78043fa3a5cf8d7d512602bb640ada36055

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