Malicious PDF — malware analysis report

Static analysis result for SHA-256 469df862f8617aa1…

MALICIOUS

PDF

72.4 KB Created: 2021-09-09 16:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48bfb859386ba8c253b0399518afd302 SHA-1: 603a1e8e2dd7a32b64bb4ac15bbf30c00eaee6a8 SHA-256: 469df862f8617aa15e13f68d1bffa6a7bf95fbac710ae6141056a34333c085c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the high number of external links suggest it is designed to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://autodilykanka.cz/cmsimple/images/file/lepizelakunabopusonifepo.pdf
    • https://reclamesticker.nl/images/uploads/file/
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e5b48192415fbd26dbf7580e9702ff33/rusowawipomudibig.pdf
    • http://universalthailand.com/images/uploads/ckfinder/files/46271357653.pdf
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/1075899138.pdf
    • http://koala-al.com/d/files/gazugan.pdf
    • https://tnmkor.com/FileData/ckfinder/files/20210907_D461879A62420D4D.pdf
    • https://tenutaedone.com/filesUploads/file/47285656594.pdf
    • http://mu-rrrc.com/userfiles/file/kemimubevopixagaxinabupoj.pdf
    • http://4998horo.gmmwireless.com/contents/files/sajumaxojatesaxodirana.pdf
    • http://lacasedescaraibes.fr/file/59843355487.pdf
    • https://autonoleggioassereto.com/file/18901758395.pdf
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/57437641355.pdf
    • https://benhgout.net/uploads/Files/file/fikewefazojiwima.pdf
    • http://pecsimutargygaleria.hu/files/file/womeduvawuvub.pdf
    • http://studiozoppini.com/userfiles/files/duvinenutinaxowof.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ed31c601bf993543c3590b07f9c41f8e/99225697012.pdf
    • http://inphilong.com/upload/files/93226191467.pdf
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/jogunaxutokuno.pdf
    • http://akinmedikal.com/uploads/file/83100581582.pdf
    • https://virker-ikke.dk/files/56199792747.pdf
    • http://bangdientunhk.com/upload/files/63834298397.pdf
    • http://nc-israel.ru/upload/files/gibexoxonulawepurixuvur.pdf
    • https://a-metal.e-giant.net/archive/file/files/24638066645.pdf
    • https://dichvuhappyhouse.com/upload/files/muzuvamo.pdf
    • http://motovelo-nmsk.ru/userfiles/file/manisunuke.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=list+of+most+common+phrasal+verbs
    • 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_off0000b93b.bin
3a56585772a7a48d8c4cdba1678f64a99cc413f10b696d1379666833fcc01ea1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB93B 16692 bytes
font_01_sfnt_off0000e352.bin
4287161bf1ec6818df4621446532da1bf931d797d764cf11c0ddf24f3451bb33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE352 10908 bytes
font_02_sfnt_off0000fc2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 16792 bytes

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