Malicious PDF — malware analysis report

Static analysis result for SHA-256 22672064875aacf6…

MALICIOUS

PDF

73.8 KB Created: 2021-03-27 20:26:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 202735957e434b3232e28a19cd619239 SHA-1: 1f03d4c485d5cb00abd27d5854a45fc0be3c86c5 SHA-256: 22672064875aacf6233d2e7fcc5eb3c9a0080b7b05a9c5a2a2a428ab9f1b783c
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'jacksth.ru', suggesting it is designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to 'Anatomy and physiology of spinal cord pdf', aiming to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/award?keyword=anatomy+and+physiology+of+spinal+cord+pdf PDF link annotation
    • http://introdom.ru/10903909540h56qn.pdfIn PDF document text
    • http://nuxogigenoporoj.22web.org/zosizewozem.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/BgfBgji/jidetur.pdfIn PDF document text
    • https://cdn.sqhk.co/fupokiwil/gjVISih/solitaire_card_games_free_online_to_play_now.pdfIn PDF document text
    • http://intekzafast.online/lutubudifokalupozerezepvr6sj.pdfIn PDF document text
    • http://ouily.xyz/39767228792y44l7.pdfIn PDF document text
    • http://usesol.xyz/81910125225e4k54.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/jaghogW/musicians_friend_customer_reviews.pdfIn PDF document text
    • http://limecash.xyz/fire_wyvern_ark_iddk671.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/fNih0nE/synonyms_of_spectacle_nouns.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dibijix.rf.gd/formalist_film_theory.pdfIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_dd6ee582dec5477281010e68616cf9c3.pdf?index=trueIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_570403da63364ae8abd6947c3345ad7b.pdf?index=trueIn PDF document text
    • http://veselawo.rf.gd/51853001100.pdfIn PDF document text
    • http://bowedujo.rf.gd/modekagukulitiwij.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_6bfad2380dc44fef9512dcbeac7cc657.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_ca6c53e587834167b183aaa6702e656e.pdf?index=trueIn PDF document text
    • http://lizesurova.rf.gd/bizhub_c258_manual.pdfIn PDF document text
    • http://banixirojifomem.epizy.com/autocad_advanced_3d_tutorial.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_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 5660 bytes
SHA-256: a165deec8f32bd91e56b8b558ac5edd5749d6c2d7c149f8ecbaba3f779dddb5d
font_01_sfnt_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 11084 bytes
SHA-256: 3a60c61543c2a737c8122217e79a15e1a828534c0985bdb609fa2cc9d5d2cfe5

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