Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8644c26063cb5d…

MALICIOUS

PDF

73.4 KB Created: 2021-09-13 20:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7e6e906dedc578bede099efa8badb4b3 SHA-1: e6819d272396aabed6fae2df95df7281f1a4d7b1 SHA-256: 8d8644c26063cb5d8f445b9b1d30b0ff9e21dc27f1c3903f15db5a9c20eba940
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://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

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