Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf938a642227cd5e…

MALICIOUS

PDF

84.6 KB Created: 2021-04-02 23:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3a2914865104af46442894d2e507c33 SHA-1: 926519c8af78b54f01139455fe15b7912a66ecfa SHA-256: cf938a642227cd5ebe2b663737f8991b64407b8057abf94e9b38c10424e05b0e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=celeste+chapter+2+heart+hint
    • http://bt-management.website/where_does_the_word_kin_come_from7r8cz.pdf
    • http://naturaitalia.space/79434987980bbdm1.pdf
    • http://gixipures.sportsontheweb.net/aiag_cqi_14.pdf
    • http://mastera-saydinga.ru/plantilla_nomina_excel_gratis_2018t3svt.pdf
    • https://gareketekefebon.weebly.com/uploads/1/3/4/6/134695024/2711536.pdf
    • http://nanebaxexob.getenjoyment.net/13608176972.pdf
    • https://gawinageriju.weebly.com/uploads/1/3/0/8/130874076/ropamufumibi_kerubuvoletu.pdf
    • http://sugameloxufe.mywebcommunity.org/what_is_the_dominant_theme_of_the_yellow_wallpaper.pdf
    • https://jebovemedafo.weebly.com/uploads/1/3/0/8/130813903/godovija.pdf
    • http://nasty666.space/27360559072pttkk.pdf
    • https://luwimaxilonava.weebly.com/uploads/1/3/4/7/134772317/baxuvisabo.pdf
    • http://perevozka.ru/jawisegag8c2ms.pdf
    • http://help-verifiedbadgecenter.com/xekizuwuxunjfyt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_eedb52592e9647958b8408428a156b70.pdf?index=true
    • https://471876dd-1950-42f1-a4b7-18bccbaeda70.filesusr.com/ugd/5d8976_fe9b53f5b47d43efb0070346bb8dd902.pdf?index=true
    • https://b6d28218-96ba-4f98-b9c1-0d78b4e6fe84.filesusr.com/ugd/47aa88_55ce398e1bd54ad4932844d87cd74a64.pdf?index=true
    • http://dilutibu.onlinewebshop.net/dovupoziwamozav.pdf
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_0bff7cf235704464acd46028cc944b3b.pdf?index=true
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_851dc3bd79d2492ebe1b7881633188a7.pdf?index=true
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_98d452c08f0f4990b559c94dce98a2bd.pdf?index=true
    • http://luregaw.onlinewebshop.net/calendario_2020_para_imprimir_argentina_con_feriados.pdf
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_c478d218fefc4d10893c87ff00643d73.pdf?index=true
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_8e465b7139494e52b4edd324c2a4a6a3.pdf?index=true
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_8550bd5171af4e80868731f856952562.pdf?index=true
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_9c15c5dfb2e84b2a909769d3faee33c1.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d51.bin
ddb3d98c973e514174b4a1aa019df477e9ad22f21bb056a08367ba5bfb259547		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 5056 bytes
font_01_sfnt_off00011e75.bin
afff447b3071de8fb9358c84280ff8cfdce364c28c04e4ef6bfd62a6565f1345		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E75 10784 bytes

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