Malicious PDF — malware analysis report

Static analysis result for SHA-256 76df2833ac65fd2d…

MALICIOUS

PDF

85.0 KB Created: 2021-03-18 11:50:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7fdaf13fceebab71cf51b2cec21bc7b0 SHA-1: be6311641701854bc506eb58f93877df51d9cae9 SHA-256: 76df2833ac65fd2d387b668a76184c3860edd42ad38e4f16d17e67c4532cfcbf
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to 'bologen.ru', which is likely part of a lure to trick users into visiting a malicious site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the idea of a web-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=chevrolet+captiva+manual+gearbox PDF link annotation
    • https://batozovij.weebly.com/uploads/1/3/1/4/131455337/7730230.pdfIn PDF document text
    • https://nixuxani.weebly.com/uploads/1/3/4/4/134433038/5baa6e7ba2.pdfIn PDF document text
    • http://rankingcoach-seo.com/35855650819j752l.pdfIn PDF document text
    • https://jupurelapuloful.weebly.com/uploads/1/3/3/9/133997255/mulavurapakefig_vikenez_lavotonilerusa.pdfIn PDF document text
    • http://rusherx.studio/how_to_reset_maintenance_required_light_on_2009_priuskw8jt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tuxenipup/71588605406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b81c0a0-22cf-4334-b2c6-dd216a820641/both_sides_now_guitar_tab.pdfIn PDF document text
    • http://fadifisevak.epizy.com/advanced_engineering_mathematics_by_stroud_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce239b5-38ac-4034-8541-6afc763cb310/cloud_atlas_2012_cast.pdfIn PDF document text
    • http://lewalogedo.epizy.com/hotstar_app_for_lg_smart_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/67751638865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e699f1c-bd6e-4cf5-a401-574d9d2f4c36/lixitategonabev.pdfIn PDF document text
    • http://lamisegowa.epizy.com/wixitelowuzajope.pdfIn PDF document text
    • http://rijevugez.epizy.com/baal_veer_video_3gp_tinyjuke.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/rimipali.pdfIn PDF document text
    • http://marenoko.epizy.com/65059438341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/906b4bca-a3ef-44d8-abfc-52c77b4a32ba/zoxurutadaxavimufog.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 5344 bytes
SHA-256: d42825b7494031dd472ac5e2e5f0cecc167ad694be9bb2eee93c7fa69433cba9
font_01_sfnt_off0001120a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120A 11440 bytes
SHA-256: 44871a5653fccebcdee71749d76a3b44541eb2a58d19adff64db0140ece044eb
font_02_sfnt_off00013902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13902 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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