Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf601ba657fb1274…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 16:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 263300fcc5aa34deaaa8cf6ffd778d19 SHA-1: f5df8a9a18f9c6d04ed6de80ed1bfe342e059b0b SHA-256: cf601ba657fb1274a3d902fc6cf858bf189b44b6bd2118eb8a503474b250d82d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161377fe6514f3---26958630764.pdf In PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/worodonuzudazubo.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/6402782275.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/xubuk.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/35782615960.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/fawafika.pdfIn PDF document text
    • http://sergeybazarov.ru/file/60610212164.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/98831329651.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/lumorenipesarewigumexudon.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cc671c91d---wadajuvopegadovagizedate.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/vagitudefotuperatopujug.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/lazejiromifi.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/semozulupotaxinunavonuwer.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/14762634778.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/tuvubipapeleronajezega.pdfIn PDF document text
    • http://blueyee.com/upload/file/022004424162.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/nemekerojaruvixuxaso.pdfIn PDF document text
    • http://hadt.vn/upload/files/xumokivu.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/xokajasud.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/35783322015.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/zigus.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/54723114391.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/11961741924.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/lunefuxifofipenejozisit.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/jifigat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=watch+jumanji+123PDF 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_off0000d62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62F 18576 bytes
SHA-256: fb1d73c2464ed74b6ade9e421338cb028740fee50f9e025427a2cd350617f431
font_01_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE1 10496 bytes
SHA-256: 4029e43c75101b61d0bf1347d5a3ea75bc98ba99b175493651695cf5e23173da