Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce59028298b597eb…

MALICIOUS

PDF

74.0 KB Created: 2021-03-29 17:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f064cd172fcd29b411e6ab2c8285325d SHA-1: 1e2d9a354b959061ed1afbd88a3529ab4f466934 SHA-256: ce59028298b597eb86db6212cd65a2dfec68eb106af277fcc8152589ba6ff251
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, with one prominent link pointing to 'ponafet.ru', suggesting a link farm or redirection mechanism. The PDF structure also exhibits duplicate object definitions, a common obfuscation technique in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/wix?keyword=west+springfield+high+school+sports+twitter
    • http://rigoditibalun.mywebcommunity.org/fundamentals_of_digital_electronics_free_download.pdf
    • http://wide-take.top/what_if_movie_kevin_sorbo_castqi8bh.pdf
    • http://pro-gram.pro/bastien_piano_book_3gmboa.pdf
    • http://lebedugipul.mywebcommunity.org/46124107643.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_9e4ba898f6b84293a7f6e32d500cb9b3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4bc3030b-0caf-4cd0-ac5a-4db9cfb3ae47/kajerogadipasiruponuzu.pdf
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_da69acdf07b14d61bed533aac776a7a3.pdf?index=true
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_c462f644f35543d8bc0ba5f5c72e283e.pdf?index=true
    • http://madigekole.onlinewebshop.net/66264812085.pdf
    • https://f2203da8-4034-475c-a980-a37079f2cd7f.filesusr.com/ugd/d29026_cb7b772cc4944cf58f4c0e596d03ad23.pdf?index=true
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_b57fb3a9619e4203aeec59ef9d3e3782.pdf?index=true
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_ecf45f2758274f3fa29cff76b220aada.pdf?index=true
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_865ba7b742e04cf995c3ae038f626fca.pdf?index=true
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_a1ffc7fb373e4dabbdd44711e263651f.pdf?index=true
    • https://d1ced4a1-fa29-4c66-b583-77209f32159a.filesusr.com/ugd/c88d8b_a34327157f2a49aa98fca2b354745d8c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bf069706-a391-4bd4-9a4c-c8e0be4d0079/93243079982.pdf
    • 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_off0000e2bc.bin
92d66db4ec3f6b20621cb17868c8f84ee7042a437769697568f11354e1069ed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 5312 bytes
font_01_sfnt_off0000f4e8.bin
ac9bb21a79186aca56fe44b4caecb94242f3c3f671f64b26573a611ae2282851		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 11068 bytes

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