Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f34065ed5c0ede…

MALICIOUS

PDF

99.2 KB Created: 2021-03-26 07:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 05bb41fd5ab675fbca832f714b7a37e6 SHA-1: 2850ce31d057deba0e59c032a8555d0d56e6a619 SHA-256: 85f34065ed5c0ede38469be8066a16ad7fe77a9c2f113cbefb4e2c57e64e5e65
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one pointing to 'baarspo.ru', suggesting it acts as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a setup designed to distribute links from disposable hosting. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://baarspo.ru/123?utm_term=aha+antiarrhythmic+guidelines PDF link annotation
    • http://gagivukamuw.getenjoyment.net/ryobi_1800w_210mm_sliding_mitre_saw_review.pdfIn PDF document text
    • http://negedibomul.sportsontheweb.net/gojamuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450140/normal_60346eebb1d9e.pdfIn PDF document text
    • http://lesuxofozadize.mygamesonline.org/my_son_my_executioner.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_60468a4ce50a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449622/normal_6011b77490b88.pdfIn PDF document text
    • http://fevozogu.iblogger.org/american_football_uniforms_usa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_600e71f6e3c02.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/93840555328.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/37213955751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb1faf4a-f2ce-442e-997a-4196c7555da5/can_i_use_my_xbox_turtle_beach_on_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/98074504591.pdfIn PDF document text
    • http://xipanizi.myartsonline.com/75082912704.pdfIn PDF document text
    • http://dojidusajotat.epizy.com/lapezebipopazoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2719efc-8dd5-4872-8873-988e449c3a08/the_cat_in_the_hat_knows_a_lot_about_that.pdfIn PDF document text
    • http://sokekakeloji.onlinewebshop.net/tasukopivegowovok.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/rudog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14f8cf09-5bef-495a-a443-d8679ef7fc16/hpolw_watch_wr30m_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f71f208-04fe-4f7b-9513-7ff07bb3a9c5/what_degree_do_you_need_for_supply_chain_management.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/msds_sheet_lithium_polymer_battery.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_off00014552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14552 5444 bytes
SHA-256: 62a63e66e092810c8f173747c2d2656476371d7612652b10db9199362b607201
font_01_sfnt_off000157b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B2 12032 bytes
SHA-256: 96ab9ea358e0d702b6ee46c782a3f96f05ba66aaa4fcd0d37f72029a1fdefd83

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