Malicious PDF — malware analysis report

Static analysis result for SHA-256 e542177a50a63f90…

MALICIOUS

PDF

86.7 KB Created: 2021-09-11 21:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4fc6391030ed4921d08d9538379718d9 SHA-1: f4176a0b447ea865d19845c3bd42f6f86f8b2aa8 SHA-256: e542177a50a63f90b37e86cdee35fc5aae9bcf9046c8d9531b5091e80fcc731d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host links on disposable domains, likely for phishing or malware distribution. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2934

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.
  • 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
  • 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://infrive.ru/uplcv?utm_term=android+emulator+win+7+32+bit PDF link annotation
    • https://pastelbuilders.com/userfiles/file/57333158348.pdfIn PDF document text
    • http://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/30183938608.pdfIn PDF document text
    • https://ikansambel.com/contents/files/rugomemajuvedo.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/71543539067.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/tufamigopurerazovezutorof.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/52224422824.pdfIn PDF document text
    • http://handgun.ee/media/file/rowoxi.pdfIn PDF document text
    • https://red-adlay.com/upload/files/pirakedojuzalonabozodosu.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/pajupiwepaj.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/25240086731.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/69199900279.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/89836972136.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/29962143688.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/21841076673.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/japekonexilelewesixa.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/kemewos.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/27543935017.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/23126655005.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/rezarizisol.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/3314134397.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wunabosofagazeluwubegowep.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/5152486675.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/72348644083.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613173b4287fb---17266089800.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/dizivonukijobu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 10888 bytes
SHA-256: 854d01dc114dba857da6b0acbbcc7fd84f8ecc50fddc399ae3b251c86e976e90
font_01_sfnt_off00011f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F65 18856 bytes
SHA-256: 20682517f54aa8ef913b6345c6bf6e3bd212d0b49b46a67bc3d9082e9493372b

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