Malicious PDF — malware analysis report

Static analysis result for SHA-256 a133c2e885909273…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 01:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 389972f7c3171d6561d72c4158ff51c5 SHA-1: e1916e2d1d2f54ca2a2e38dbf3fdfdcf9fa495c2 SHA-256: a133c2e885909273e421b680dd10ad1f23818056eea146be8f1d9478c5400711
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains an embedded JavaScript stream. This script likely facilitates the redirection to external URLs, as indicated by the numerous embedded URLs found in the document, many of which point to disposable hosting. The PDF's structure and the presence of JavaScript strongly suggest it's designed to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=vijay+tv+tamil+serial+list+today
    • https://partroyfuneralhome.com/partroy/assets/file/36677544987.pdf
    • http://getsolarnj.com/userfiles/file/84523860632.pdf
    • http://www.bash.cl/media/file/42727194390.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5ca7f2579---74838095598.pdf
    • http://fishngrill.iorderfoods.com/uploads/files/7176804521.pdf
    • http://www.awakohchang.com/image/upload/File/ipol.pdf
    • http://olech-rzeszow.pl/userfiles/file/14514354922.pdf
    • https://www.alitec.es/js/ckfinder/userfiles/files/790159320.pdf
    • http://vstarmp.cn/upload/files/20210916_141208.pdf
    • https://lixtech.com.tw/ckfinder/ckfiles/files/wejifuluv.pdf
    • http://dotbamboo.com/file_media/file_image/file/32640763768.pdf
    • https://bacsionline.net/userfiles/file/24087851360.pdf
    • http://global-leasing-management.com/uf/file/53428066288.pdf
    • http://www.zywawiara.pl/pliki/90367920316.pdf
    • http://mim2010.ru/userfiles/file/1300895639.pdf
    • http://studio-castiglioni.com/userfiles/files/30998369252.pdf
    • http://csaladiegyteruautok.hu/userfiles/files/gisejesulog.pdf
    • https://kaplaitalia.it/userfiles/files/26374635856.pdf
    • http://ingatlantv.tv/userfiles/files/5221388803.pdf
    • https://regaluxiluminacion.com/uploads/assets/file/sefaporipufukix.pdf
    • http://constantemails.com/userfiles/file/163072914190749755433.pdf
    • http://greenld.com/userfiles/96231564193.pdf
    • http://yishiweb.com/upfiles/files/20210909_212835.pdf
    • http://rem-proekt.com/f/file/30556876948.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e28c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 16792 bytes
font_01_sfnt_off0000fa9e.bin
55920f93977a2c6d875d15332f8d7cff3c3a105d2366ea22de9915964d46c082		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 17192 bytes
font_02_sfnt_off000126dc.bin
87b2f57ab848223fff88b4a5385774760b3bf43367c735d37ae3df8cea828c32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126DC 10584 bytes

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