Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d6239ae42fd6785…

MALICIOUS

PDF

93.4 KB Created: 2021-09-16 04:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a4b3e087ff39d9857c6028d7dce89323 SHA-1: 24b8fcaf8d7f268e8186dd3baee72415a50bd2c6 SHA-256: 2d6239ae42fd678529a945aeeaa6dab9f5f8f6d174b5d946728213e27b550e5c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers flagged it as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be intended to trick users into downloading an archive, possibly containing a further payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://novichiha.ru/pic/file/nabojolijorusagisiket.pdf In PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/nojiwu.pdfIn PDF document text
    • https://t2sc.me/userfiles/tavapeguno.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/74335201951.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/dixub.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/91101983677.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/vawelosegatew.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/6685521983.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210914_6EB937F6075FA691.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/povigobogoduk.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/fefusujorazuxoxes.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/79980385039.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/jotexoru.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/mepiluta.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ead718eb7---20071234239.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/91406309091.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/94340912892.pdfIn PDF document text
    • http://soupworld.de/upload/file/pumozobedu.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/disarakamimowiwenamevuv.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/lekibi.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/febezijixele.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/mubesimavukozi.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/redokupeparinupobadabu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369dde4473e---vuzerukasowarabiw.pdfIn PDF document text
    • https://signika.pl/Upload/file/84121110763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ppsspp+compressed+gamesPDF 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_off000109cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CD 18096 bytes
SHA-256: 1dfb556c51b7e018eeeced5066c2d8053cb3a63614b4d9a3b834f57ed2048252
font_01_sfnt_off00013810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13810 10516 bytes
SHA-256: 564ce5163362113e57e41ca2add292f5e6a8941f312ac478575a5deeae38e58a
font_02_sfnt_off00014fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1