Malicious PDF — malware analysis report

Static analysis result for SHA-256 371aae817f21a84b…

MALICIOUS

PDF

85.5 KB Created: 2021-03-14 10:16:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c143da8325391cf1a1a4b781ac4d73fb SHA-1: 2f4495c7d97c45880a7f804a77ca0558a1deef61 SHA-256: 371aae817f21a84bd7248ef729eb45758d2517bc9392ace4ac2aaee57c6667cb
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, with one prominent example being a link to 'leonvi.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially harmful websites.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=samurai+ii+vengeance+mod+apk+1.1.4
    • https://static.s123-cdn-static.com/uploads/4470016/normal_5fe09d36c7044.pdf
    • https://cdn-cms.f-static.net/uploads/4476270/normal_5fd64d0dd5799.pdf
    • https://static.s123-cdn-static.com/uploads/4369305/normal_5fdd76609d849.pdf
    • https://sunarikibuniteg.weebly.com/uploads/1/3/1/3/131381519/6506107.pdf
    • https://static.s123-cdn-static.com/uploads/4393625/normal_5ffeff312b24b.pdf
    • https://static.s123-cdn-static.com/uploads/4472186/normal_5fc61409b0210.pdf
    • https://gakikodokuni.weebly.com/uploads/1/3/1/8/131857060/d85b4b81.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ad0ec8e4-d604-463e-a6a2-4dfe3567e9e6/how_many_amps_does_a_dometic_13500_btu_air_conditioner.pdf
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_c500ba590fad4f309316006cd6167073.pdf?index=true
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_a4a80a0ee2db41d491c96076fe98e828.pdf?index=true
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_1de5c7b0333f4a88a8413142c85d299d.pdf?index=true
    • https://s3.amazonaws.com/gajakelegeza/bivekabenibakinuje.pdf
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_52c2879cd2a241389f6f8ada2b1b64f8.pdf?index=true
    • https://s3.amazonaws.com/sixolose/89177750735.pdf
    • https://uploads.strikinglycdn.com/files/4b2d786c-19e6-4992-96cd-473bf714ab7c/56734525073.pdf
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_2712dc5f385b45e9a97c58eea248adf8.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f843.bin
f72d6a329bf5c17e4b51e0c0bf653edc2b6308abf4f37175bfaf239e6af89d43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 5584 bytes
font_01_sfnt_off00010b4a.bin
5ec80ee09315dbaf055cb56fa7692da331bd3c7823d6de9cb6df250372c1d205		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 11344 bytes
font_02_sfnt_off00013260.bin
05a361d0af7e6aff53b1a4b6975b6b4b16e9af004de2941092012965a2788337		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13260 16432 bytes

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