Malicious PDF — malware analysis report

Static analysis result for SHA-256 535983f52e096aa8…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 15:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86736011e7410f1ff1a81e54c3c518b0 SHA-1: a8ad82da4c615a33b850236ba1c593353beb0bea SHA-256: 535983f52e096aa873c9d86e3f1d46cc28532baa6fa12ebb1b493fb49226a9ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are structured as link farms. Heuristics indicate this is a common tactic for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest malicious intent, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=the+new+world+order+book+pdf
    • https://amgaa.org/temp/files/nukiburewo.pdf
    • https://xpress2.eu/ckfinder/userfiles/files/zilogupojibunozaluto.pdf
    • http://mdsalon.ru/img/lib/file/mexewawixapitemepubef.pdf
    • http://alpha-th.com/userfiles/file/2755251830.pdf
    • http://davidhammerstein.org/ckfinder/userfiles/files/xixis.pdf
    • https://micro-logic.ro/images/uploaded/file/nezoraxonupuliraraj.pdf
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/xazalogojofewevejo.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/wituvajikiso.pdf
    • http://shesob.com/file/files/38844791543.pdf
    • http://okna-stv.ru/userfiles/files/lexexebuderijiduripa.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/jutozatusifepa.pdf
    • http://china-zub.ru/userfiles/file/lutasatemakituveze.pdf
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/70886280690.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f6a591455d295fcb460123cb3c77df79/nenumatagitedapuked.pdf
    • https://copperscraphandlers.com/ckfinder/userfiles/files/ladevamediwedabu.pdf
    • http://drcleancenter.com/uploads/files/202109021210476802.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/9143d5021fe322be0bc5667b1476165d/44271043063.pdf
    • http://sanfrancescovet.com/userfiles/files/faduzuxomurimavowunul.pdf
    • https://speakingparrot.com/upload/ckfinder/files/71708575359.pdf
    • https://quizai.com/uploads/files/12944127735.pdf
    • https://cingenito.ca/upload/editor/file/82590642638.pdf
    • http://weingut-suppan.at/files/bipozobetofadonuf.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_off0000c02e.bin
7637ba788fa11f13ce67561ce061757bb448caa06019ee87136d085523f106ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC02E 10356 bytes
font_01_sfnt_off0000d740.bin
6a3ed0deef75534163510859b367c6750942849aa553ba1a89b7383f94a0fceb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD740 16532 bytes
font_02_sfnt_off00010166.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 16792 bytes

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