Malicious PDF — malware analysis report

Static analysis result for SHA-256 de30306e6a46aca9…

MALICIOUS

PDF

76.3 KB Created: 2021-03-02 14:45:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 51480bdb4a9af70b8c0987a5d8db3e03 SHA-1: 6f95225136657a4c6ac27ee8db4c7affb4d56b59 SHA-256: de30306e6a46aca901dd61a971d0d6f4a174587ad18cddc53a7ea6a1232bc042
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous external links, including one to 'resalured.ru'. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9631

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 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.
  • 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://resalured.ru/award?keyword=how+good+is+a+bradford+white+water+heater PDF link annotation
    • http://mapotilij.mygamesonline.org/86184783844.pdfIn PDF document text
    • https://novomuzedideb.weebly.com/uploads/1/3/1/4/131406537/de2700.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/kujeso.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/97512043171.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/casio_tough_solar_g-shock_watch_reviews.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/do_you_need_to_use_the_water_filter_in_the_keurig.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/dazutun/cidco_lottery_online_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/gazifojizu.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/siluzabiwobuxos.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/58171102651.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/live_tv_free_apk_app.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/sitalikadorob.pdfIn PDF document text
    • http://fojosotum.myartsonline.com/rixiwusulijajoge.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/strength_of_materials_ppt_free.pdfIn 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_off0000f73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 5328 bytes
SHA-256: db9603c51a675bab8c9d77b096f7fae2afa5dc71d850b3dd5a2d7f6945b8109e
font_01_sfnt_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 10476 bytes
SHA-256: 44a5aeda0ce6c454daca7a0e36f282490e76344b469f32a0379ce8dd8aded335

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