Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf87b55a2c8f13a…

MALICIOUS

PDF

63.3 KB Created: 2021-02-27 06:16:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 000123074115b3f0831dce0e1dd20d1e SHA-1: cb750f14ad5200270a4a8c331ff2de5b3ce6d330 SHA-256: 2bf87b55a2c8f13a866dbdf5e1fbc2cc1d1653b8e0468f70bcf82de6437b9bdd
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with one specifically pointing to 'midufefew.ru' and including a 'utm_term' parameter suggesting a phishing or redirection lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm hosted on disposable domains, further supporting a malicious intent to redirect users. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest the PDF's purpose is to drive traffic to malicious sites.

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://midufefew.ru/123?utm_term=prince+lestat+and+the+realms+of+atlantis+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445573/normal_601272830bf48.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/cgoRZgf/pyramid_runner_rugs.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/36172641803.pdfIn PDF document text
    • https://cdn.sqhk.co/semexixok/iaB9CMH/13675072712.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/27588974969.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/jbap1B0/hobby_bird_of_prey_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/merisipugito/fohfuno/supreme_bubbles_apk.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/yamaha_moto_4_350_tires.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/nivozelinazolofarenuzezu.pdfIn PDF document text
    • http://christmas-gift.ru/definition_of_non_probability_samplingr67nt.pdfIn PDF document text
    • https://cdn.sqhk.co/bimonabozo/egjEmia/belushi_chess_coach_snl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukutinupamebo.rf.gd/jafafejotesokepozosifedes.pdfIn PDF document text
    • http://wikatamuk.rf.gd/geniv.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/how_to_remove_the_rubber_seal_on_a_zanussi_washing_machine.pdfIn PDF document text
    • http://suzaxefewisuvek.rf.gd/gafokofojutarex.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_off0000bbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFF 5396 bytes
SHA-256: 6ab730453bd77dcc4b17401cdcc76ef9d28efd121a5421f5bac3f0e8ee22c17b
font_01_sfnt_off0000ce2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2D 9912 bytes
SHA-256: 0b3fda4215842e88ac0eb71a6d9a544c5db20db8b5c6c72693fa50e34bc9aeb0

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