Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b55f84c8c3003b…

MALICIOUS

PDF

77.6 KB Created: 2021-01-24 16:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 29143b848d39d834a3e1847a9be93ee8 SHA-1: d7d85f833882b8cc79569578f5351e9ab3a5114f SHA-256: 29b55f84c8c3003ba40114596633c972cfe162184c3291c48008224d7d8763e5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely involving the execution of embedded JavaScript to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/123?utm_term=bricks+breaker+quest+unblocked PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374689/normal_60052edc9f2d9.pdfIn PDF document text
    • http://ehaberdevlet.com/all_hashtags_for_youtube6v9sb.pdfIn PDF document text
    • http://torevifij.iblogger.org/tetutokujo.pdfIn PDF document text
    • http://technodom11.com/logabakakwkg0a.pdfIn PDF document text
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/1890384.pdfIn PDF document text
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/4bed94d7b81e.pdfIn PDF document text
    • https://tulixepatezapik.weebly.com/uploads/1/3/4/9/134902644/3765615.pdfIn PDF document text
    • http://golivexi.22web.org/huntington_s_disease_fact_sheet_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://najefitisefema.epizy.com/chehra_masoom_akhil_song_pagalworld.pdfIn PDF document text
    • http://tifureboriva.epizy.com/5879999326.pdfIn PDF document text
    • http://suferipuwa.epizy.com/28812379942.pdfIn PDF document text
    • http://marivugedada.epizy.com/system_center_orchestrator_2019.pdfIn PDF document text
    • http://kovawasokagi.epizy.com/gulokibijisagebiz.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9F 5312 bytes
SHA-256: de53f3f297e70c4ba56d927e5cd53bf04a874492bae1adf11011d5243dff22f6
font_01_sfnt_off0000e0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BA 10784 bytes
SHA-256: 33d3694d2d68dbe7dbcb96b2b59b1453d520d70850d62a36083ad0888aeb1624
font_02_sfnt_off000105b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 20864 bytes
SHA-256: c2653bf7f6aa2fefc8c2d2863d6195e957b2435a7f8e79a2b21cca79c45b72f3

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