Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a8ce60fb0e1ee8…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 03:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4281eb3ecde9a7476fb6a61a0a4ef6ce SHA-1: c6748bd9672a66ae2a3cdb9bb4999210ddd2b9d8 SHA-256: 56a8ce60fb0e1ee82189dcad27a791226301db0dcaca4a6340d583591ce58e69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. Heuristics indicate this PDF is a link farm on disposable hosting and has been flagged by ML and ClamAV as malicious, likely phishing or a trojan. No scripts were extracted, but the extensive use of external links suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pixomot.ru/uplcv?utm_term=best+android+tv+games+without+gamepad PDF link annotation
    • https://sapsda.com/SapmaUserfiles/file/98114655181.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a9aa872cc---gakojuluturaxajusor.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/97444483106.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/10377505688.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/48f4e15fbb397816dbd3df6ffcbce167/39709947410.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/sigirekorojugepu.pdfIn PDF document text
    • http://serting.eu/userfiles/files/75066362735.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/masigex.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/ginujagovenef.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/bedopenudepeluximoriv.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/58991809038.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/surivezipevojisijabelam.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/wurugedape.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/38351981632.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/36706704015.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/pubevewejipebalozub.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/diboxomozaragofu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380a5791a4f---birikivulivuvovolupetijul.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/73175409508.pdfIn PDF document text
    • http://jaqalsports.com/files/file/wituxudetidepada.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/basudufexolefusijelo.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/64562013398.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/65450118361.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/napufosonesemenapujo.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/varorowaniwuxapuxusov.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/35306642218.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 11096 bytes
SHA-256: 44332c6fe793c67272b7adec2373f264a83fa260d258c6d61cb9a8076838a91a
font_01_sfnt_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BA 17708 bytes
SHA-256: aeb832981bdcd4c73f5bbe1b42248e09425bf6892f8d10514841754708a3d53d