Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d15f656265d0061…

MALICIOUS

PDF

73.5 KB Created: 2021-03-25 01:26:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3189deec8808c5efece3270d63379809 SHA-1: 99d6c46d3bb250282cc7df74cdb9e464881e0f44 SHA-256: 8d15f656265d0061175cb429a82c469af0c02c7a96abfc870da94b453a11c593
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'seumenha.ru' which is likely used to host phishing content or a secondary payload. The document's structure and embedded links suggest an attempt to trick users into visiting malicious sites under the guise of official documentation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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://seumenha.ru/award?keyword=attestation+de+domiciliation+de+salaire+pdf PDF link annotation
    • https://lozagazol.weebly.com/uploads/1/3/4/2/134266804/2f65b78913b.pdfIn PDF document text
    • http://tebeririz.scienceontheweb.net/libro_la_maestria_del_amor_resumen_por_capitulos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496602/normal_601e13610fa83.pdfIn PDF document text
    • https://jenamojid.weebly.com/uploads/1/3/1/0/131070605/kulaw.pdfIn PDF document text
    • http://zusagukitu.mywebcommunity.org/ielts_writing_task_2_sample_band_9_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427809/normal_5fcacd077ab41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463825/normal_603f8103341d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499958/normal_5fe55836312b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410204/normal_6015d7ded012c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb71deac-5427-4a11-aec2-6feec017c243.filesusr.com/ugd/4cd983_1bd2d4d1e0cb40878216b15b89e1524b.pdf?index=trueIn PDF document text
    • http://judiserod.onlinewebshop.net/log_log_graphing_paper.pdfIn PDF document text
    • http://jopiwutipav.epizy.com/tabozomazuzuj.pdfIn PDF document text
    • http://bejegexojadivaj.epizy.com/dell_optiplex_gx620_video_drivers_windows_xp.pdfIn PDF document text
    • http://xadeboni.epizy.com/zaxidafuvono.pdfIn PDF document text
    • http://wepolaxozerev.epizy.com/samsung_ml-2510_laser_printer.pdfIn PDF document text
    • https://65f7c47b-6fa2-4aed-9649-637438a88329.filesusr.com/ugd/8fb471_e1a94da0e6c94d8284447cc360069a10.pdf?index=trueIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_dd986a9f2a4b4391bbf82ace2869800e.pdf?index=trueIn 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_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 5288 bytes
SHA-256: 6f90ee6dc3fa08ae5824dbd258007c46ea46b5de502ca986a7c84fa5ff6d2c64
font_01_sfnt_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 11724 bytes
SHA-256: eab50cd7cc1e821c9b08d12c8c3dde2ebae7dbcefaa7a8adb9dbb2f893290b79

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