Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a49e9d5d1614a2…

MALICIOUS

PDF

82.9 KB Created: 2021-03-02 16:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a350d8b3be4634188b55fc188d696397 SHA-1: cd0f9dc9a3093fa627c8705e583164d257df52af SHA-256: 66a49e9d5d1614a20a6db59663fcf89339c4cde2ffdabdf9cb65f4ca2736ca74
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to various PDF documents hosted on disposable domains, indicating a link farm. This technique is often used for SEO manipulation or to distribute malicious payloads. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=how+small+of+a+hole+can+a+bat+fit+through PDF link annotation
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/4aba67043.pdfIn PDF document text
    • https://dasasaperot.weebly.com/uploads/1/3/4/6/134665710/2419945.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366366/normal_5ffdda828b766.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/fDLggZ8/school_management_system_project.pdfIn PDF document text
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/ritafezil-bedesile-bifenigepu.pdfIn PDF document text
    • https://pubedazemel.weebly.com/uploads/1/3/4/8/134870130/2393913.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489607/normal_5ffbdfada22f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416786/normal_603d817606b6f.pdfIn PDF document text
    • https://cdn.sqhk.co/mizogujuzo/Egjifjc/orc_civil_war_lotr.pdfIn PDF document text
    • https://cdn.sqhk.co/lukejisuvawe/hYhhha9/hover-_1_transport_electric_scooter_charger.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/Bifidja/abc_wide_world_of_sports_ski_jumper.pdfIn PDF document text
    • https://cdn.sqhk.co/juzurupivepo/z7Zgdjh/watch_me_whip_and_nae_nae_choir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_5fdc870c23c3f.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/fujuvizep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 5488 bytes
SHA-256: b9ca99dd6b316271c4f03956cfb8167db0a5f5b63a435f7138f528a037a59498
font_01_sfnt_off00011a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 10504 bytes
SHA-256: b7305023427622e9f07f8bb9e9d6190439cc75ca19b427de78c15f05925baabc

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