Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f21c83211d74a2…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 20:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92d6868ebfe6f037a8e2778bf7409d8a SHA-1: 98ac8b484934a5fb330a9b43406bf7a64d31ba5d SHA-256: 09f21c83211d74a288f87284bff6159a2318ad63ee0a1855f717cebbd8bdc6be
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • 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://smidgel.ru/uplcv?utm_term=bloons+tower+2 PDF link annotation
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/28499807324.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sumazovezexo.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/98950244121.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/guvejaxo.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/kituwigunotetopef.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/zenarexara.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399110a81ca---74723011152.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/xewekoxizutebejaxomonofap.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/xigewop.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/lutogaja.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/42314561767.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/48712503561.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210902174354.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133799c89d35---9696048991.pdfIn PDF document text
    • http://bulmarconsult.com/files/vabowoxabipenalur.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/zelilutilonezipesitejeg.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210913113831.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/40232058522.pdfIn PDF document text
    • https://kenadong.com/contents/files/88265709690.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/kagimaradixowimis.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/nafoneruwu.pdfIn PDF document text
    • http://elsped.hu/files/file/madanutug.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/31173785105.pdfIn PDF document text
    • http://juha.be/_files/file/tutedaxiwogenitox.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/xeximekutejonuperisokovef.pdfIn PDF document text
    • 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_off0000bf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3A 18260 bytes
SHA-256: 0adf060b4ebff1cd03cb6b853f44572397b569df549619237a1ca25435287bc8
font_01_sfnt_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10740 10108 bytes
SHA-256: 66031e3418a2584e0b659aa49ffcdab7e333c7c5f171ec4812358df99f788918