Malicious PDF — malware analysis report

Static analysis result for SHA-256 360070575a6c12fd…

MALICIOUS

PDF

73.9 KB Created: 2021-05-18 10:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f90cb1349a0c82660076beb1f2d50d4 SHA-1: ef2db7bc11280aca95aa5b96f5b3272fb3485715 SHA-256: 360070575a6c12fd8a674d930ad8e74fa0e2ee9123f179c6326575c6af5aea39
156 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic, with one primary URL being https://vilenefex.ru/strik?utm_term=baby+nest+free+pattern+pdf. The document body is heavily obfuscated, preventing a clear understanding of its immediate user-facing purpose beyond the lure of a 'baby nest free pattern pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=baby+nest+free+pattern+pdf
    • https://cdn-cms.f-static.net/uploads/4495551/normal_604f271a09cf8.pdf
    • https://pepevifive.weebly.com/uploads/1/3/4/4/134480859/xudajep.pdf
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/dc8bb0936.pdf
    • https://cdn-cms.f-static.net/uploads/4476281/normal_604e2708d3b8c.pdf
    • https://novufetus.weebly.com/uploads/1/3/4/1/134131343/gowuladetowizosubara.pdf
    • https://puwikemumej.weebly.com/uploads/1/3/1/4/131454306/2977544.pdf
    • https://cdn-cms.f-static.net/uploads/4369491/normal_6052f2baaa3f3.pdf
    • https://cdn-cms.f-static.net/uploads/4366666/normal_602468d45143e.pdf
    • http://vagivosifogezer.22web.org/44513910415.pdf
    • https://cdn-cms.f-static.net/uploads/4468267/normal_600c1ab147fd4.pdf
    • http://zogufovitem.22web.org/samsung_chrome_xe303c12_specs.pdf
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/8676040.pdf
    • http://sijodegovawa.iblogger.org/73654352322.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cc6d86d3-3b98-4308-b8a3-9840ddd51d7a/best_wordpress_themes_for_authors_2020.pdf
    • https://uploads.strikinglycdn.com/files/c67da5ad-7a31-49f8-ac4a-0cb865081e0d/bezoxurutobigan.pdf
    • https://uploads.strikinglycdn.com/files/368c942e-1cdb-45ea-94e8-59c1f9977333/deripowadavesam.pdf
    • https://uploads.strikinglycdn.com/files/5e133f21-c6a4-4fcb-93a9-615df6512537/11626298258.pdf
    • https://uploads.strikinglycdn.com/files/a66680f1-ae19-4f89-93ce-a5cc81a3665f/36329542247.pdf
    • https://uploads.strikinglycdn.com/files/053173cb-522f-4ddb-a155-6e89f1816609/how_to_use_astro_a20_on_xbox_series_s.pdf
    • http://kufilabed.epizy.com/33675938291.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_off0000e124.bin
4679c0452bd60f8616fbe4510a7bf84c7e46e864c297927b50a9d5d83f14b439		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 5296 bytes
font_01_sfnt_off0000f33a.bin
337f9c885db70231430ff5026503382dfcdd39f02c65a13ddec7ae07faac111f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 11592 bytes

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