Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a2bf6607f001cf…

MALICIOUS

PDF

68.0 KB Created: 2021-10-01 09:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7518c75bcc04e3404a7f981fbd3fdd63 SHA-1: ac474127a258ee80e8b2c77c9ae6423e881c05e8 SHA-256: a5a2bf6607f001cf1a692db3842ae9833f7fc2f8bc9de6f989f85e02fa7693d8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged as a link farm. ClamAV detection and ML classification strongly indicate malicious intent. The presence of embedded URLs suggests an attempt to redirect users to phishing or malware hosting sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://liepasmuiza.lv/userfiles/library/defivuturip.pdf
    • http://cortocircuito.trialpanel.com/images/Upload/files/23016974093.pdf
    • https://tort-art.ru/userfiles/file/petorixagim.pdf
    • https://psg66.ru/admin/ckfinder/userfiles/files/pubajigizapojitomosure.pdf
    • http://vinmexindia.com/uploads/33925184088.pdf
    • https://cottingham-group.com/cufiles/files/meximerelefopo.pdf
    • https://asesoriagade.com/app/webroot/files/files/samuj.pdf
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/37388108052.pdf
    • https://etadelloro.it/images/file/bibun.pdf
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/ragewonapefexup.pdf
    • https://aljazeerahdrilling.com/userfiles/files/16187918628.pdf
    • http://atlonnuri.org/UpLoadImage/editer/files/pedugirimexisakipu.pdf
    • https://menu2uplus.com/images/file/20210817809.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/wijatisatapibapuwagagit.pdf
    • http://skybuildinfraprojects.com/uploads/kixolo.pdf
    • https://ecpa.fr/uploaded/file/wotopudewixajejupononik.pdf
    • http://h-n-s.net/userfiles/file/41218112083.pdf
    • http://hndgyl.com/v15/Upload/file/20219111851447042.pdf
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/71434339369.pdf
    • http://ping-property.com/user_img/files/97901766005.pdf
    • https://dzido.pl/userfiles/file/42278043315.pdf
    • http://koreadramatour.com/FileData/ckfinder/files/20210930_4625788EA493DBE6.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=speed+post+customer+care+number+kerala
    • 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_off0000aca7.bin
3806ab02825c93258a9d4ab3ea02e7c643fd225ef377a3fcab9538ad1efb1fda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACA7 10992 bytes
font_01_sfnt_off0000c5ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EE 16792 bytes
font_02_sfnt_off0000de00.bin
d8147c8c1da55e1ade50dd6f96648962bc18a6a7a62c6dfbfa84a6785e513cd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE00 14704 bytes

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