Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1373667804ee1a…

MALICIOUS

PDF

83.5 KB Created: 2021-03-30 11:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2143deb0932ba76812c6793eb7ca743f SHA-1: b93e1102a8a92799b40d8aacdbb69b277e98ad29 SHA-256: 0c1373667804ee1a3576eda685efc36ae51b8528243c2c03bc9550ab979f5be2
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, many of which are SEO-optimized, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to reference a game guide, likely a lure to direct users to malicious URLs.

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://resalured.ru/wix?keyword=fire+cape+guide+osrs+ironman
    • http://vizilirudigub.getenjoyment.net/banking_awareness_testbook_2020.pdf
    • https://cdn.sqhk.co/teposodigar/FUNghgh/5287635194.pdf
    • https://cdn.sqhk.co/pesasotiro/rifG0UT/xonofejitimijamenitu.pdf
    • https://cdn.sqhk.co/sebutarukaw/aYjdigs/the_walking_dead_new_episode_trailer.pdf
    • https://cdn-cms.f-static.net/uploads/4495994/normal_6048e46c01c78.pdf
    • https://static.s123-cdn-static.com/uploads/4379234/normal_5ff9460343d1b.pdf
    • https://cdn.sqhk.co/zulatobi/hzbMSjb/dupirenebamununewati.pdf
    • https://cdn-cms.f-static.net/uploads/4496391/normal_60214f8f2a7eb.pdf
    • https://cdn-cms.f-static.net/uploads/4368477/normal_60415e33a2d34.pdf
    • http://wumomotetidofe.getenjoyment.net/ninjutsu_techniques_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4450890/normal_5fe7a450c5bb6.pdf
    • https://cdn-cms.f-static.net/uploads/4504047/normal_602751d55e33e.pdf
    • https://static.s123-cdn-static.com/uploads/4407724/normal_5fddb8e4751fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_1f9509d05ee94cc183c81ce42b1c1f6b.pdf?index=true
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_bfc7a5f5a5a545e29af0bf52868b18f0.pdf?index=true
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_871af05d324c4933850064ec36bff181.pdf?index=true
    • https://b6e49935-6d58-4bde-831f-6e0b746776d3.filesusr.com/ugd/7d321f_84c3ae82c0874b0d867f9b5ebf6c4b66.pdf?index=true
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_9cee069dd1564f748d021e077aa646c5.pdf?index=true
    • https://3e206333-d6ff-4be5-a246-6289f7259d3b.filesusr.com/ugd/973a7d_8a13a450fe8942648c4a838ecf477829.pdf?index=true
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_946d8d8d0f5b4417847d288f502dbb89.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_off00010a03.bin
a9f26c6540247eb1b53cea514e98cb2f2412315884fdcc59e6a97cd0a21cff79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 5316 bytes
font_01_sfnt_off00011c07.bin
956e2df7f71e798481b67e25485678e8dae4debf1d45f87d26d0787bc280907c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C07 10884 bytes

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