Malicious PDF — malware analysis report

Static analysis result for SHA-256 259479acd53843de…

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 17:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b499df8e74e4cc1fce0f018971797615 SHA-1: 39df9b88cddb2a2e02a235ed8098f5bc3ab08600 SHA-256: 259479acd53843de15f5acf300dcb8df771b3708666e24ff21c924f3552cdfaa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links pointing to potentially malicious or disposable domains, suggesting an attempt to redirect users to harmful content. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://minhkygroup.com/luutru/files/91153152334.pdf In PDF document text
    • https://esz.jp/img/editor/files/sasezasofotafunize.pdfIn PDF document text
    • http://chapelguild.com/images/usr/fizesepezopuwajaxufubus.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/pizelatusezupudi.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/92518159699.pdfIn PDF document text
    • http://186086.com/upload/files/napobitoletumumu.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/gedejefazekerok.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/tojewokirufesobiveder.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/60908480972.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/82182112066.pdfIn PDF document text
    • http://dalaichau.com/files/31091514409.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/q3qrljp400375h820k4gqoklv3/webimevunivukelinig.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/zuvulumobefujegupijize.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/neduz.pdfIn PDF document text
    • http://fgosvo.ru/files/files/zogurixaforabinapubi.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/lazekajoditamuwatuzizinu.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/tabad.pdfIn PDF document text
    • https://buka.ru/sadm_files/9876299792.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/91298277072.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/5921661399.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/6630244664.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131dd0a95c7d---sobawerebotisosabefudisop.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/nigediwopozap.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/98167331521.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/40706134805.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/kivabedip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+auto+default+music+playerPDF link annotation
    • 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_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 10976 bytes
SHA-256: 0b9ec030e47964550cea3d0120cb241e5584544d1dc6a9fb8f448cb808c4766d
font_01_sfnt_off0000fb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 19284 bytes
SHA-256: ffb7fb823c0daf4ddfdff95e5388b6af0c9b064458bd0162160a6c2d9cb0c395
font_02_sfnt_off00012d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1