Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0111519760cffb…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 07:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23821e6525872c66c6c2d89379f36190 SHA-1: 5bba8c5bb546519d7706be06815b5fddc6db93c8 SHA-256: 0b0111519760cffb0ae67c78493154bd6e6444464f0bcea76c7d53bb4e019e6d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://rheinfurth.de/userfiles/file/sisosakup.pdf
    • http://uralinteh.com/uploads/files/38391964842.pdf
    • http://teplorium.su/userfiles/file/mivaxeritaven.pdf
    • http://agriturismolionsfarm.it/userfiles/files/vateda.pdf
    • http://consorzio-csa.it/userfiles/files/kefarezalenilodasofoxinob.pdf
    • https://superpart.com/files/91712159962.pdf
    • http://olgapolyakova.com/files/files/pesewitekirewar.pdf
    • https://elesud.it/img_pagine/file/81954643427.pdf
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/tokoxun.pdf
    • https://xtrafitcoaching.com/www/images/files/10210724196.pdf
    • http://www.dr.schure.net/ckfinder/userfiles/files/dizomesujigapoxavutukep.pdf
    • https://jatransfer.com/userfiles/file/tedurexozuxazatumekovit.pdf
    • https://ww150002.linebot.net/upfile/files/20210904211556.pdf
    • http://retco.ge/ckfinder/userfiles/files/xalokutaputubaged.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b8fbef42---59058120236.pdf
    • http://kenhuffbuilders.com/userfiles/file/mafizurezexituwog.pdf
    • http://gerastar.com/userfiles/file/lutubat.pdf
    • https://chaletsuenodesol.de/files/30431953121.pdf
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/28833637139.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/68861525020.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=application+tv+orange+pour+android
    • 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_off0000d15e.bin
aa37131e56e284c566d4c3e81fcc454f787f713eab7b746fe9ef4fa4b682d705		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 10668 bytes
font_01_sfnt_off0000e9ca.bin
79efd1724bc9be6eb2c84fdef6e620385fdc9e3cc03f2657c1c47ee0526ec956		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 18448 bytes
font_02_sfnt_off00011994.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11994 16792 bytes

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