Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7e9cf218a23ec5…

MALICIOUS

PDF

75.3 KB Created: 2021-03-28 13:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 303f7c15912da9e91de5837d86616a98 SHA-1: bef7752859648812e13249e607df0310a860b0c7 SHA-256: 7d7e9cf218a23ec588ea2ea5caa93ccd17edaf651708717efd72ef0677b42640
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and potentially a phishing or trojan delivery mechanism. It contains numerous external links, many of which point to potentially malicious domains, suggesting a link farm or redirection strategy. Although no scripts were explicitly extracted, the PDF structure and the presence of external links indicate an attempt to redirect the user to malicious content, likely for further exploitation.

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://vilenefex.ru/123?utm_term=interior+and+exterior+angles+transversal+worksheet
    • http://flowerport.store/pidawidegijobajamiv9gcuk.pdf
    • http://leftoutclub.com/xetakepobodufavanhgy91.pdf
    • http://kieverts.xyz/809581637299um0q.pdf
    • http://noverst.xyz/temporalmente_suspendido_de_juego_coptued.pdf
    • http://doucheapp.xyz/33289364364csbi6.pdf
    • http://shopwithsale.website/betika_lite_appev9fk.pdf
    • http://doucheop.xyz/47950388903is2so.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_167efd9d3a5b45b1a233cd8d8af34e36.pdf?index=true
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_5b5d39f49cc64d5ea435078094e38c7a.pdf?index=true
    • https://07a970a6-a864-461d-ba0c-8deda34efc75.filesusr.com/ugd/b56c0d_b3f62495293d4dd88fa26e2a639fb36c.pdf?index=true
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_f79e5d915a0b4455bfa4ff935685a45c.pdf?index=true
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_73866700ae844157a9ad438a0e81e5c4.pdf?index=true
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_519e3ed6dd384fee9d9f5d089a2a4820.pdf?index=true
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_da6e95f628294ab2b7a88904c77c1cb2.pdf?index=true
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_bde5a4698f8c4c71bd750bba1a21f970.pdf?index=true
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_ed59c783395140c4bde05fab22ab79b2.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e793.bin
6336ae1680760448b53ec12288a577535b2450e6ebcecafd8f161af54ef68f3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE793 5308 bytes
font_01_sfnt_off0000f9af.bin
213f7b6572a2e75276381227caf412f5d7bf36f709d724ca8450eeb7bd7f9d09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 11284 bytes

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