Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9e4a668137087a…

MALICIOUS

PDF

86.5 KB Created: 2021-04-17 01:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e67523d7b94da5fd44371e664b3ea73 SHA-1: ee766aa39e03e7cbd17aab053ff3897005befd8f SHA-256: 9d9e4a668137087ae5d39646fb778ad9478b82442d03eddc950170d35f2f522c
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings or distribute malicious content. The presence of a specific driver download lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and URL findings are sufficient to infer malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/strik?utm_term=dell+62yvh+rev+a00+motherboard+driver+download
    • https://fiselowozol.weebly.com/uploads/1/3/4/3/134366189/4300297.pdf
    • http://goginexoze.22web.org/fazikuwa.pdf
    • https://vegekonewipure.weebly.com/uploads/1/3/5/9/135964828/kekifi.pdf
    • https://gidapozu.weebly.com/uploads/1/3/1/3/131379371/9e674f5ecd6ba.pdf
    • http://kebenoda.scienceontheweb.net/fabokesup.pdf
    • https://takojozosuliwo.weebly.com/uploads/1/3/0/7/130739597/pugez.pdf
    • https://rejasujewefem.weebly.com/uploads/1/3/0/7/130738882/dezapozi.pdf
    • https://timivoza.weebly.com/uploads/1/3/5/3/135315173/9de34bb9e5e6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bemabam.myartsonline.com/organelos_celulares_unam.pdf
    • http://fepusum.onlinewebshop.net/68655384845.pdf
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_c2203ce1442f4b7bb01d3521d54545c6.pdf?index=true
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_f96c5b2999b842c79cacccabe7ca2cf6.pdf?index=true
    • http://polabufu.myartsonline.com/togutirudaxafaz.pdf
    • http://samajusinifako.atwebpages.com/50707881789.pdf
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_23431a7291ec4214a7366ff5e857766c.pdf?index=true
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_6728b5605310412eb2af423a2d239cc3.pdf?index=true
    • http://nuwiron.rf.gd/51792381478.pdf
    • http://bavotuvezomevi.myartsonline.com/991496404.pdf
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_b2bea77336264a249c3ad35b680f34f6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001039d.bin
09067fb740263d298627c0b66de07ba9708f08e670495191a7a8ff6988fd4149		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 5496 bytes
font_01_sfnt_off00011635.bin
0c62c62ffd2b3ed277c345f6821962014f565e71d946bffaba65460cd099b28f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11635 11368 bytes
font_02_sfnt_off00013c6e.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6E 4324 bytes

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