Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dbf9fe3fa2b3a62…

MALICIOUS

PDF

80.5 KB Created: 2021-03-13 21:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 270865fd93e30b754804d52ed17d4027 SHA-1: 6b565562d66bca993b8dc86c37de16041b7cce95 SHA-256: 3dbf9fe3fa2b3a628019d618e37eb1b24da795f9b9a72ba401f806aed0617f80
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a primary suspicious URL being https://bologen.ru/strik?utm_term=monstrous+definition+and+sentence. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed to host malicious content or redirect users. No scripts were extracted, but the overall structure and URL analysis point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/strik?utm_term=monstrous+definition+and+sentence PDF link annotation
    • http://tameenegypt.com/ganamrutha_bodhini_sangeetha_bala_padam_english_free_downloadyskvh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472208/normal_601b4478c3f78.pdfIn PDF document text
    • http://zhigina.ru/632618276tk5cl.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/hidigLh/5_seconds_of_summer_band_members.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/what_is_the_moral_of_the_story_in_hansel_and_gretel.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/93519651142.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377925/normal_5fc71b10c782e.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/cjigcCh/79421828776.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuxilav/WiiT2hh/film_barb_wire_sub_indo.pdfIn PDF document text
    • http://bilkan.fun/kopigagibazupukuxi1xway.pdfIn PDF document text
    • http://onesmall.space/5606422142stfm0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529697/normal_6023ec8a3d415.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/jaujchf/54717141376.pdfIn PDF document text
    • http://wedasuf.getenjoyment.net/african_alleluia_satb.pdfIn PDF document text
    • http://sarhello.online/what_does_mortification_of_sin_mean7r3n1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425926/normal_602dfdc281be3.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/gmihkii/directv_sunday_ticket_free.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/lopadivupudexa/fallen_lauren_kate_blurb.pdfIn PDF document text
    • http://wififeju.atwebpages.com/94283851076.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/gatonefatazesilisubiki.pdfIn PDF document text
    • http://bitines.myartsonline.com/jelisuletad.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/18389348718.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/adding_and_subtracting_polynomials_quiz.pdfIn PDF document text
    • http://vobozezojip.onlinewebshop.net/75025875864.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_off0000fccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 4988 bytes
SHA-256: e779333e1fda4c5b4dbc9bfc6aa72af768c3d48431ed4ef841b3b8d012cab268
font_01_sfnt_off00010ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 10872 bytes
SHA-256: 241ecbe77de530354da61a72e7d185eb72447dcc80a9a8a19452068efbbf59bb

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