Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0f36f4b34e6c89…

MALICIOUS

PDF

79.4 KB Created: 2021-04-07 07:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8d9b12c456a51672d6bfa226995c7110 SHA-1: d9f81e828713449e374a1f712fedcb250c9e6780 SHA-256: 2a0f36f4b34e6c892d5e333c9701746ae69ffef2a4412f92e10c73b5e229f451
134 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a phishing lure, specifically mentioning invoice or payment language. It embeds multiple external URIs, with one pointing to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://gimoguvi.ru/123?utm_term=fixed+asset+turnover+ratio+balance+sheet PDF link annotation
    • http://topepuxabi.iblogger.org/alcon_mail_in_rebate_form_2019.pdfIn PDF document text
    • https://zugufirit.weebly.com/uploads/1/3/1/1/131163535/ligazepofavon-nufum-madajafar.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/icfgcia/hundred_years_war_timeline_of_battles.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/kRibigE/kung_fu_fighters_in_ufc.pdfIn PDF document text
    • https://cdn.sqhk.co/vegubefeno/hjibUjG/sakasozasofudixigonemi.pdfIn PDF document text
    • https://paboripiniw.weebly.com/uploads/1/3/0/7/130739049/88ee2be9d769445.pdfIn PDF document text
    • https://lasasozizo.weebly.com/uploads/1/3/4/0/134041343/tumog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://728bf1be-24e3-4891-ba98-fedceca1a503.filesusr.com/ugd/3268c8_b22f610dc2894484901a73b6137a20ce.pdf?index=trueIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_fb9b1fde213c4cca952eb663418d9687.pdf?index=trueIn PDF document text
    • http://wetavirevamo.epizy.com/59339340466.pdfIn PDF document text
    • http://zomekitutaduvuv.rf.gd/what_therapy_is_good_for_anxiety.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39c34930-6b9f-4e32-9405-782e07d50c75/how_do_i_reset_my_lexmark_printer_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e3af2c2-890c-4f66-98d9-c7681f4f21fc/98146735749.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/impossible_quiz_2_answers_unblocked_games.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/35521317808.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/acth_stimulation_test_protocol.pdfIn PDF document text
    • http://voresabuso.rf.gd/doodle_4_google_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/how_to_install_water_filter_in_kitchenaid_side_by_side_refrigerator.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/29165238701.pdfIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_b6e71b6e5f414eed829986b3ed97cc71.pdf?index=trueIn 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_off0000f9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 5252 bytes
SHA-256: 1bda759eded7eca1c912c837d97286c1bba3393ca8d81261e4711b40f5c8538e
font_01_sfnt_off00010b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 10672 bytes
SHA-256: 8d05131ff061c8d6168fc9d5e1f1cb2060b9ff41019da4cc318f46fb6b581640

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