Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d38f3cc5ab8568e…

MALICIOUS

PDF

75.7 KB Created: 2021-03-02 00:49:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c04524bb3792e155a9d88fa6c649606e SHA-1: 5abb13e243ba078fde33fb5bb1123038f32d5c30 SHA-256: 0d38f3cc5ab8568e09aef30bb685d8f8b20459643f6e4bc4743d82740f97df73
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to external, potentially 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://xezojetit.ru/strik?utm_term=distributed+operating+systems+concepts+and+design+pdf+download PDF link annotation
    • http://kompledom.com/asvab_for_dummies_20186soik.pdfIn PDF document text
    • https://cdn.sqhk.co/zunowexafa/cYt4Igi/777f_crew_rest_area.pdfIn PDF document text
    • http://videohost.space/23376312828fe8gh.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/SiiwijF/wheel_of_fortune_games_by_tim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375514/normal_601fc5c2864d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412757/normal_5fdb8c1690bd9.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/fchhu8y/sky_force_game_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/ijdaifw/white_noise_generator_app_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/hhjdjgc/83301292436.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/Ahi30ja/fifa_2017_penalty_kicks.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/Cifhbhj/how_to_decorate_a_bundt_cake_with_icing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374196/normal_5fe8eef19d346.pdfIn PDF document text
    • http://byt-upak.ru/redfin_portland_condos8yib8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fokogemuzaraw.epizy.com/16067844887.pdfIn PDF document text
    • http://nomulumipal.rf.gd/78727866707.pdfIn PDF document text
    • http://pawajoxonebozew.rf.gd/porilatiginosokivarutarax.pdfIn PDF document text
    • http://gozosowizopuk.rf.gd/basha_movie_tamilyogi.pdfIn PDF document text
    • http://vekalaluno.epizy.com/fadufarawibewu.pdfIn PDF document text
    • http://dizepeliw.epizy.com/how_many_books_are_in_miss_peregrines.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_off0000eaed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 5808 bytes
SHA-256: be11eff3be8d471a3e160834a9f057f1c67cb6566f5ac5c6c9e4cb742ccd5912
font_01_sfnt_off0000febc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBC 10020 bytes
SHA-256: d57e5a8daee49bbac85833b99a3876c5c34893af34c7c340e34334052c4a9b90

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