Malicious PDF — malware analysis report

Static analysis result for SHA-256 b69acc6688a9f3e8…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 07:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aefeeca5c5d83d6a184aef2fba11d522 SHA-1: 35e6e1a7b81af6aa09e1722e343bfd7be8280ddf SHA-256: b69acc6688a9f3e883bffe28bcd9474f8947efd653c9eecf725e22cad9b2bae1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. It contains an embedded URI that redirects to a link farm, with one specific URL pointing to a potentially malicious PDF. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.findvoters.com/userfiles/file/nasesenevidudosu.pdf In PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/bipix.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/vizotonolasuvalajebik.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/zevurotumajig.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/fodapasegizepelijog.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/lezemire.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/97069154316.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/kosejigumak.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489540d47f3---retoda.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/razusop.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/79275332643.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/3741027762.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/90421497634.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210921_38AA1827E527C0D3.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/97815613355.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/24957842758.pdfIn PDF document text
    • http://eternoohydro.com/d/files/bidelevonadewumerafebo.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/zegosizipalatoluxova.pdfIn PDF document text
    • http://cudicio.it/images/file/56041368396.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/muxetizez.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/13204736581.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/merojofanegubuvugamobafu.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/46028845d517c8864f5805dc9f6684b6/gavavuxejaxurez.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/soriwadixokej.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/62718269336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=playboy+magazine+mod+apkPDF 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_off0000aef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF0 10776 bytes
SHA-256: da9f421766c6bc2e3af3b73adfa852085711d90498588354d96ae2a21caf293a
font_01_sfnt_off0000c749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC749 14532 bytes
SHA-256: 980815f9e984cb2692cde40b213d609d6b3af89789049311496617453960839f
font_02_sfnt_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1