Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b713dc8bf31f65…

MALICIOUS

PDF

83.1 KB Created: 2021-04-16 09:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a78392675e2a9a4aef95b6c811ee1e6e SHA-1: d6bb453fb78ddfa06e49cc910ca33a8269d84b5f SHA-256: 33b713dc8bf31f65dbd56fcc3fdc24f89d11933bf54a9889aaba972f6e5cdfc0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially malicious or low-reputation hosting. While no scripts were extracted, the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

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://druttle.ru/strik?utm_term=themes+in+wuthering+heights+sparknotes PDF link annotation
    • http://hydrofthol.space/crossfire_series_sylvia_day_orderi0vyn.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/iiOjabb/stick_kung_fu_street_fight_apk.pdfIn PDF document text
    • http://tugrull.com/how_to_choose_the_end_behavior_of_a_polynomial_functiongtao5.pdfIn PDF document text
    • https://cdn.sqhk.co/lojewewure/AicoVAq/padai_veetu_amman_movie_songs_masstamilan.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/good_books_on_history_of_islam4y7se.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487206/normal_600ca67382a6c.pdfIn PDF document text
    • https://cdn.sqhk.co/zexetiminav/dWFgfVk/gravity_wave_definition_in_astronomy.pdfIn PDF document text
    • http://normab-id.com/72540718485tsrsa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377663/normal_6005b9fb79923.pdfIn PDF document text
    • http://aazzzry.space/aurora_hdr_2018_fullmm79f.pdfIn PDF document text
    • http://xaraxag.mypressonline.com/luzedimixoworaxujegog.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/vixaliligiwimufef.pdfIn PDF document text
    • https://cdn.sqhk.co/xisalaximel/jehiSlc/addon_jurassic_craft.pdfIn PDF document text
    • http://degifutuv.scienceontheweb.net/7th_grade_math_final_test.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuminexozuvino.atwebpages.com/20516544725.pdfIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_f3f4fa3202d14be4bb8307895e871446.pdf?index=trueIn PDF document text
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_22072cb5371c48598a78e9e3e174d067.pdf?index=trueIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_6a08135d251d467595d614f8e7f94886.pdf?index=trueIn PDF document text
    • http://dapekafuxururo.myartsonline.com/captain_sim_777_manual.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_off00010350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 5304 bytes
SHA-256: 8874e1cd13acac065ec58bbc642fa031dab6467ebbd186f82c93febabe46dd5f
font_01_sfnt_off00011541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11541 12408 bytes
SHA-256: f16c407ab12196fefc48e7bc8e3cb30a69482533dfef1bb50526569ceb8d6240

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