Malicious PDF — malware analysis report

Static analysis result for SHA-256 3371483fbf613727…

MALICIOUS

PDF

79.1 KB Created: 2021-04-06 09:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ece0322c31ad7cbae11774373de2e1c SHA-1: 1fb6b80220b782208fc361d151478094695af24a SHA-256: 3371483fbf61372768efe81844ec6efe843ca99d1c90a4686aceed6498ac265f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a lure related to 'Mansions of Madness', indicating a social engineering attempt to drive traffic to these external resources.

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://dugedepap.ru/aws?utm_term=mansions+of+madness+suppressed+memories+contents
    • http://nenegifivujaxu.mypressonline.com/90161661330.pdf
    • http://pasiworuwiwoz.getenjoyment.net/64005182782.pdf
    • http://vubitim.sportsontheweb.net/how_much_can_a_pallet_jack_lift.pdf
    • http://zarabatyivat.ru/how_to_cut_with_a_miter_boxx3jc7.pdf
    • https://cdn-cms.f-static.net/uploads/4481156/normal_60226bbdec08c.pdf
    • http://bloomwithdeanna.com/xasuwasofzsji.pdf
    • http://fazoluniguket.iblogger.org/scp_containment_breach_save_game.pdf
    • https://cdn-cms.f-static.net/uploads/4479212/normal_60327facdae6b.pdf
    • https://cdn-cms.f-static.net/uploads/4418369/normal_605815db0f905.pdf
    • http://xenalebosob.scienceontheweb.net/serenutitalodelirotofamuv.pdf
    • https://cdn-cms.f-static.net/uploads/4376358/normal_602ac963acf1b.pdf
    • https://cdn.sqhk.co/jivaduzar/a282Hhi/73230963825.pdf
    • https://cdn.sqhk.co/bujiwamovul/hggipB0/shark_ion_f80_vacuum_canada.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jamenajiko.myartsonline.com/what_are_the_best_penny_stocks_to_invest_in_right_now.pdf
    • https://aa700e4b-9450-4a85-8b7e-8c92ffe47626.filesusr.com/ugd/de972d_50acd76d00574009b6bfa428ecc63da9.pdf?index=true
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_4214196c79e24c5993bceeb021bb11a4.pdf?index=true
    • http://zopoxasemegivo.epizy.com/53720975420.pdf
    • http://kupikobu.epizy.com/bhairava_songs_video_hd.pdf
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_14c77e4ab5b74222b068e366e9498243.pdf?index=true
    • 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_off0000f4a4.bin
1ff61c8817532aca8938dad5ea308ca53af3172600b4dbdd2342f55fb9d8bf5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 5276 bytes
font_01_sfnt_off0001068d.bin
56235e29898ee1942d8a37a811e413ef4e36b0e5e5f2bba571ce0f21fa38815b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 11304 bytes

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