Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ddd7fc2d63e21a…

MALICIOUS

PDF

72.4 KB Created: 2021-09-15 13:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d52cf82ebd5aba6bb03d190b32914eb3 SHA-1: a01464515d6451243d995eae85ef7a84567eee99 SHA-256: 50ddd7fc2d63e21ae202baefd87f3526102a95baf2f02d3ac34b1a4972eeb0ed
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a 'SE_DOWNLOAD_BUTTON' suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=xxnx+apk+download
    • https://cncunse.com/d/files/89332284395.pdf
    • http://files.ibiza-ferien.de/file/boxowofazamebaz.pdf
    • http://daisin1977.com/js/upload/files/14722366411.pdf
    • http://ipllaser.in/uploads/zavojeg.pdf
    • https://henseltech.cz/userfiles/file/99746485411.pdf
    • https://netcsemege.hu/ckfinder/userfiles/files/binikane.pdf
    • http://dayou.tw/uploadpic/files/202109110317442454.pdf
    • http://gardenofsound.com/userfiles/files/dajuxunotusopuvebelizoru.pdf
    • http://kbcsisa.com/upload/fckeditor/file/74970557949.pdf
    • http://maremania.net/img_pagine/file/98999795442.pdf
    • http://www.gc-antey.ru/ckfinder/userfiles/files/kixifafimafiwapenabuxemu.pdf
    • https://adepotcustom.com/UploadFiles/file/20210910195736172.pdf
    • http://dolekkoyum.com/admin/UserFiles/file/35376645448.pdf
    • https://iphone-odklep.si/vsebina/lerututijagajakolaxu.pdf
    • http://acevina.com/webroot/img/files/kegizuxavevipitolo.pdf
    • http://aquatherm-graz.at/files/98342491470.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141257aadd9f---87582398365.pdf
    • http://chiangmai-clean.com/user_img/files/63732626603.pdf
    • https://regiefranchet.fr/userfiles/files/61807883996.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f2260330d48eeaac4f707df36afd3207/48160941061.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_off0000b8e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E2 16792 bytes
font_01_sfnt_off0000d0f9.bin
9d3951f3951a4638432f3a8c4668547b67aff2afa4c3ac5e06e60afce33d9d0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F9 10084 bytes
font_02_sfnt_off0000e77d.bin
42421236dce289f237e9b85d2bb82917e89e3e1b047daaaa33346e8d68d5d6dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 17372 bytes

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