Malicious PDF — malware analysis report

Static analysis result for SHA-256 050fce4db804b112…

MALICIOUS

PDF

79.2 KB Created: 2021-03-02 18:27:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 03cb78ecfec5a09c654e91ced8f749ff SHA-1: f67dcdd99f281a081297e557275c948d27bb1be0 SHA-256: 050fce4db804b112af486033a2a64d095ce0029b7b567d438fe26126763a916d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'credit exposure' and references 'wkhtmltopdf', suggesting a lure to a phishing or malware distribution site. The presence of numerous links to disposable hosting further supports a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=what+is+credit+exposure In PDF document text
    • https://cdn.sqhk.co/pifizumux/bsjjogh/74803414707.pdfIn PDF document text
    • http://lofokumado.22web.org/59534627448.pdfIn PDF document text
    • http://good-production16.site/mumebup0bi7i.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/what_is_the_lesson_of_the_cask_of_amontillado.pdfIn PDF document text
    • https://cdn.sqhk.co/mevutaxisut/j5Aij8s/jurassic_world_the_game_mod_apk_2018.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/panasonic_th-50px60u_remote_code.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/what_are_defensive_driving_skills.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/h3ihiW7/best_wordpress_themes_for_photographers_2018.pdfIn PDF document text
    • http://wgathering.org/88393854759iovj4.pdfIn PDF document text
    • http://leledup.mypressonline.com/vuzokekebe.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/how_to_count_to_1000_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/jidgghd/video_chat_random_app_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/bipujawojeli/oihZmhh/guess_the_song_by_lyrics_metal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pibufesoxol.epizy.com/74692675545.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/coleman_catalytic_heater_wick.pdfIn PDF document text
    • http://zugejono.epizy.com/juripumalipaka.pdfIn PDF document text
    • http://wowutuzineko.myartsonline.com/timonuvotavivusizonikev.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/85825477476.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/prueba_de_coombs_indirecto.pdfIn PDF document text
    • http://sexililelaweru.rf.gd/bootstrap_template_generator_free.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/honda_eu2000_generator_specifications.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/mpsc_group_c_pre_exam_answer_key.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_off0000fa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 5212 bytes
SHA-256: 8fe473f2f78a35c47e2c279309c1c6209941afe6f42ce2b23141c6ef62c53f8d
font_01_sfnt_off00010c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C24 10348 bytes
SHA-256: 4ef4dac543418a112c25cd5439f8955ab6e58f2df37c4daea7114f1b7382e405

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