Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67e7155c1f977bf…

MALICIOUS

PDF

82.5 KB Created: 2021-03-19 19:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3faa52a485cbfa9b8503422b396cad6f SHA-1: 5fcbda719427957757518f3acd30d0462b364107 SHA-256: e67e7155c1f977bf41706285f54df8bd26cf8add8f5aeed75c7423d40346a432
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a disposable hosting domain and another to 'jumiwimov.ru', which is identified as a link farm. The document body, though heavily obfuscated, suggests a lure related to 'Perilaku hedonisme pdf'. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to malicious content.

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
  • 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://jumiwimov.ru/123?utm_term=perilaku+hedonisme+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392220/normal_60515016028e8.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/gehdoJH/mudukegudafikelisedamixi.pdfIn PDF document text
    • https://cdn.sqhk.co/tifobebe/gebhbjc/funugebew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379605/normal_5fd8e090bf9c6.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/gddulgi/kekakufajupajababobitejop.pdfIn PDF document text
    • https://cdn.sqhk.co/fusunusol/vJiehhe/poxebasumovufizewiwujubir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489588/normal_5fd1021971b06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_6d79b5ddd07f45349435ad1f3dcfbf78.pdf?index=trueIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_74fee7e8b15a40fabc65e6831fa9b71a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/alif_novel_episode_5_free.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/converse_plataforma_grises_desgastadas.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_17bb1bae0df04223ad72457c57e1e39c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a25da3f2-ed9d-4e12-af35-68465272d7f6/nuwinimi.pdfIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_e1d651f07cb5429693e01075a9850e40.pdf?index=trueIn PDF document text
    • https://aa6eca1a-c690-4a36-985e-a873157a80b3.filesusr.com/ugd/081493_288cf4e86dd54de9bbe3671c02239f23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8131bd76-29b8-448c-9099-e0c8a7bc66ef/61938304589.pdfIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_46ee549f25ec4365b3be12a0229dd856.pdf?index=trueIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_c156067a10734586a43482e240e2980b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0569907e-e857-425e-91dd-0bdde59251b8/zowifimuniforufedivotel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58b25853-8c6b-469c-a602-5deac8ad0537/64944601536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23e58174-6650-4faa-b7d9-6fdd7c0d2373/fikakavixi.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/mississippi_trial_1955_chapter_17_summary.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_off0001053f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 5348 bytes
SHA-256: fb9a2c17264e2dd1765974bf3da8f22b533dc874254dfbbe6bf14f91becb6921
font_01_sfnt_off00011740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11740 10956 bytes
SHA-256: 18842ae261805284832eca9c6ab9ffd5be851899e6100531d84289f6b679a61f