Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a5c5d787baf286…

MALICIOUS

PDF

80.9 KB Created: 2020-11-13 17:56:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e14a25a1c1ddd2e2cf87c60cb0f9af5 SHA-1: d167a60b565aa954590daa51636f54ebeddf8eaf SHA-256: 72a5c5d787baf286569c41bda41428051bd2892e6d306b35a04e79bde9523079
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to improve search engine rankings, and one primary malicious URL. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to device firmware updates.

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://trafftec.ru/strik?utm_term=actualizar+firmware+engel+rs4800s+mi
    • https://cdn-cms.f-static.net/uploads/4385021/normal_5fabaea6a215c.pdf
    • https://cdn-cms.f-static.net/uploads/4380380/normal_5f8c5756d2edd.pdf
    • https://cdn-cms.f-static.net/uploads/4490366/normal_5fabb4dc4fb0c.pdf
    • https://futuziduxe.weebly.com/uploads/1/3/4/5/134508203/xenojirofedokux.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8980310.pdf
    • https://cdn-cms.f-static.net/uploads/4382949/normal_5faac940ecae8.pdf
    • https://bolewotimeri.weebly.com/uploads/1/3/4/6/134689798/3681899.pdf
    • https://cdn-cms.f-static.net/uploads/4369311/normal_5f886b6b68e3f.pdf
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/nalijazi-xipixevaxo.pdf
    • https://vijunefuk.weebly.com/uploads/1/3/4/5/134588972/0f84478e.pdf
    • https://cdn-cms.f-static.net/uploads/4471706/normal_5fada25524847.pdf
    • https://jexedijelewa.weebly.com/uploads/1/3/4/5/134518212/kaxabed_milanupupinoto.pdf
    • https://vatalinonabalix.weebly.com/uploads/1/3/4/2/134234662/5051091.pdf
    • https://sitawixabebel.weebly.com/uploads/1/3/4/3/134319036/7232356.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/74400f97-01d8-4a52-a5d8-997e27d1d986/58519388974.pdf
    • https://uploads.strikinglycdn.com/files/a2cbfac6-8a33-421f-904f-de8808b2f1ff/58589778711.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_off0000f15e.bin
843e2a24fad6c1b22ff28f4414a2ebc70c5a823e06a0fdf6f94944d0de2503d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF15E 5528 bytes
font_01_sfnt_off0001042e.bin
2f428ba38b48459ca4ec8397dd26e0148312a7f6e3fa48a42aec1051d7a56e00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 10464 bytes
font_02_sfnt_off000127fb.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127FB 4324 bytes

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