Malicious PDF — malware analysis report

Static analysis result for SHA-256 831ae742bc0d1c1b…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 11:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 150cbf12121072473ca7099446158e9e SHA-1: 5e9681ec1eeda0d4df89c1b39a3b0d43ea60d8be SHA-256: 831ae742bc0d1c1bffc7631f56a8e2704d8a39603cf5c2a798b465f0eb6c6ed6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic findings indicate the PDF acts as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. This suggests the primary purpose is to lure users to potentially malicious websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=fiewin+mod+apk
    • https://e-uchebnici.com/img/file/43324292220.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/0ae428b87338626dfad524a165e6278a/zezazaris.pdf
    • http://wpchkg.com/upload/image/file/18336598914.pdf
    • https://woft-dining.com/webroot/editor-uploads/files/takapevajakixawajezixom.pdf
    • https://censcakmu.org/board/file/files/lazomeviz.pdf
    • http://mariautonoleggiomarsala.it/userfiles/files/dewuliwafov.pdf
    • https://wolfgang-photography.com/userfiles/files/96939346073.pdf
    • https://hoavily.com/uploads/files/31681183353.pdf
    • http://nfc-lampang.com/user_img/files/fadurakabev.pdf
    • http://studioambienteterritorio.it/userfiles/files/90617404001.pdf
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/18281317076.pdf
    • http://thestarbusan.com/FileData/ckfinder/files/20210902_5CE9023752079868.pdf
    • https://rails-bg.com/fckeditorfiles/file/foman.pdf
    • http://anindecor.pl/files/file/gifelorisasemipovare.pdf
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/rokolazi.pdf
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/vuxeze.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/2542579397.pdf
    • http://romengo.com/ckfinder/userfiles/files/3226356654.pdf
    • http://garageanything.com/js/upload/files/8534555229.pdf
    • http://npi-management.fr/ressource/site-image/files/pakin.pdf
    • https://sarvodayasamaj.uk/upload/files/boratatugapemivixaxez.pdf
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gozipesavojomarawirezusol.pdf
    • http://imobiliariaimperio.com/files/files/98817833773.pdf
    • http://zoekidsworld.com/userfiles/file/2764753689.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_off0000b22e.bin
5367cee067e12ec57a118707dcda9e7e062462e3ff37dc64e80daef67edd9079		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB22E 15332 bytes
font_01_sfnt_off0000d8c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C1 16792 bytes
font_02_sfnt_off0000f0d8.bin
8aa4296072aa4a6ef46afa6cbabbab1f96104a4c5a978668162fd1de33954055		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 10296 bytes

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