Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f8fceb6fd8f949…

MALICIOUS

PDF

72.1 KB Created: 2021-09-08 23:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1619b06fce279bb8c0c1819a87ad22b0 SHA-1: a24c8f56085f90851a48341186aaa48df2b9ce8c SHA-256: f1f8fceb6fd8f94906a9e0a99b2fd29b0dfd46a596319a28ba7114d3e31aaae3
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting many distinct links on low-reputation domains, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or execution of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5623

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://queure.ru/uplcv?utm_term=android+netrunner+deck+building+guide PDF link annotation
    • https://dogathermalhotel.com/resimler/files/ponomusofuxopamanupitese.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/bubaj.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/41516818659.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/fomowowuzulozesinexox.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/94884330903.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/joxoxipotiwo.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5b5f3678b07b1c348fd3bc09703c1100/63185954703.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/59370442184.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/teluxigiwadejinavegaven.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/sirofakowetedos.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/68553918945.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/60651057560.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/89209939061.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/vafim.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc109b095---86686670210.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/40638625842.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/lisuf.pdfIn PDF document text
    • https://tebra.si/userfiles/file/89141778274.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/lefeluj.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/73612562427.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/bilubemebax.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/tedotowuvumuven.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/jotixik.pdfIn PDF document text
    • http://arsvet.ru/img/upload/kazogumemu.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/96581663131.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 18780 bytes
SHA-256: 210d6c19456a0e3980ba201fd3eb24b4ea843c83a0915985212aeaaf97a8c6e9
font_01_sfnt_off000108a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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