Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b34fe21a739391a…

MALICIOUS

PDF

79.1 KB Created: 2020-12-27 19:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f465f4689783b975a6d92a30081bf78b SHA-1: 76afc218ae18b05f694721dd4e792d1fa0a6a06b SHA-256: 4b34fe21a739391ac6ae24c37c61679ea27f853cfa73795234161e0de71b4286
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services and are associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of external URIs and the overall structure suggest the document is designed to redirect users to potentially harmful websites.

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://traffset.ru/strik?utm_term=blocky+all+in+one+block+puzzle
    • https://cdn.sqhk.co/jememobak/eicihhe/petizipadiranagiwev.pdf
    • https://cdn.sqhk.co/kozuvurop/jghjgeZ/sakofirisukurevemes.pdf
    • https://nevonanopovew.weebly.com/uploads/1/3/4/3/134335048/zudugisanugikezup.pdf
    • https://cdn.sqhk.co/xurazegoba/Srlhihg/popular_music_artists_2020_youtube.pdf
    • https://legotukalijev.weebly.com/uploads/1/3/1/3/131380351/4435895.pdf
    • https://falufanimuv.weebly.com/uploads/1/3/4/3/134377488/xitajefazexo.pdf
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/sojoluri.pdf
    • https://cdn.sqhk.co/xixumobun/hbkjjhi/xedobafefovodewonibirof.pdf
    • https://benepota.weebly.com/uploads/1/3/5/3/135322084/d299c698.pdf
    • https://nitevugumosu.weebly.com/uploads/1/3/4/5/134526644/xigijanezobef-kajuwaxit-delukuwifatozub.pdf
    • https://cdn.sqhk.co/fijajiles/hcXThhu/7652690067.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ede60576-f984-4e9f-8fdf-a11ccb5bf1e3/interesting_facts_about_saint_cecilia.pdf
    • https://uploads.strikinglycdn.com/files/621352f7-3db2-47f7-8e2b-086ad277c2f5/99901885022.pdf
    • https://uploads.strikinglycdn.com/files/8c98a6c5-d842-4e16-843c-43e194ddeffe/libizozozizexolekemekusar.pdf
    • https://uploads.strikinglycdn.com/files/608b3b26-00df-4371-810c-7cc041781662/tifapemogolidibademafoget.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d288.bin
353edea3ee3137af1244a9d6f17483ed8aeea5a53bdb29561a8a2ad01b480d12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD288 12000 bytes
font_01_sfnt_off0000f9da.bin
c0195248de0bfb6f2eaa67733d1f20145e370b1d466fcdc5ac125cdbdae3a26c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DA 5060 bytes
font_02_sfnt_off00010b39.bin
3b2d8a6ec95e057b0938b8cbb55cb8dec4efe8ee241192c8b67c57edc507ad75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B39 10376 bytes

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