Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8d32a5263a3e4f…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 11:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc1ffa96d5e5b844784b541aa5752243 SHA-1: c4d522ac075c6e5a1e3b449d1b085f4018e3217d SHA-256: 0b8d32a5263a3e4ff38b0d61fa97471314eb3859b7f2fa9992e9286bc5a5f7d7
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these external links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://archism.ru/uplcv?utm_term=how+to+upgrade+my+android+os
    • https://vpmemorial.net/images/file/44221035572.pdf
    • http://v-lukomorie.com/uploader/files/79417601292.pdf
    • https://communeouchamps.fr/userfiles/file/rowemozifobunerumu.pdf
    • https://tybistanbul.org/resimler/files/72714059494.pdf
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/dakugowexukopa.pdf
    • http://eca.or.th/ckfinder/userfiles/files/93928474655.pdf
    • https://dalyanestate.com/userfiles/file/43627728117.pdf
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/682916836.pdf
    • http://bhttourist.com/upload/fckimagesfile/gexedilepazit.pdf
    • https://perfectsextherapy.com/public_html/userfiles/file/sutatugitutinuduzowe.pdf
    • http://balletpanov.com/uploads/files/13562071023.pdf
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/37304471646.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/ec5b84e407fef875101e709c0075dfaa/jiweb.pdf
    • http://wxmx.cn/upload/ckimg/files/202109072315173802.pdf
    • http://radissonhoteltraining.com/userfiles/file/76853228437.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e870229c8---foratipijatagugude.pdf
    • http://celesteandtorsten.wedding/images/file/furorasi.pdf
    • http://natalieshuff.com/uploads/file/kaxuka.pdf
    • http://tekizolasyon.com/ckfinder/userfiles/files/53740653548.pdf
    • https://vr-spagna-20.effievirtual.com/galeria/files/pofilejukina.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7A 16792 bytes
font_01_sfnt_off0000e291.bin
aff1bb07018de0ddc194d90d90f95e31d34cc2e22056ba6b1fdd942e6a9d3f42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE291 10980 bytes
font_02_sfnt_off0000fbda.bin
6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 1680 bytes
font_03_sfnt_off000103d2.bin
8d59026664813ec8a3d1c5fb92c276cf7d4b71e7b9c0d33359010da7494187d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 23868 bytes

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