Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a77288d2875bd6…

MALICIOUS

PDF

86.0 KB Created: 2021-09-16 10:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6ba259b1ef1c41eeb7954275a7f5792e SHA-1: 9e1a98cc7d42d0b3685b66aadaeef6b8aa907aa3 SHA-256: 43a77288d2875bd6f74abf2ab7185ff9064339f532961e5589583ec3ccf20673
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dad9bf28d---23449062974.pdf In PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/85744935398.pdfIn PDF document text
    • https://jin-ji.com/upload/files/mobiwakavisemegafafenen.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/62766729286.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/weveb.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/32246166406.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/gukajefesajonotoda.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/4429949174.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/28255492154.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/76987420709.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/95651991397.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///49131185489.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/nizoxoneruxukujo.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/doxevusakepinu.pdfIn PDF document text
    • https://proxus.nl/file/56537914883.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210915235911.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/825768097.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b31a5af276---9342175787.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/libosu.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/18972225743.pdfIn PDF document text
    • http://geasit.it/userfiles/files/98784750512.pdfIn PDF document text
    • http://cocoal.com/uploads/file/35370019854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=dream+league+soccer+2019+hack+game+downloadPDF 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_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 11368 bytes
SHA-256: 6c52f6f25d47ce950b74d4e3ec9bc3fbf2a2632f059bdc7d38be25487c70b4c6
font_01_sfnt_off0001022e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A40 18440 bytes
SHA-256: 37df22437764f34e3d039158dd6017228de21e2bf03d4edf3e0cf642898258b7

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