Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc41d2184f0eb325…

MALICIOUS

PDF

110.9 KB Created: 2021-09-15 18:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b88144ccc6acc4ff9771c572f328d0a9 SHA-1: 462c20cd6530114a486f83e61abdb92fde563bde SHA-256: dc41d2184f0eb3255de469b6fb5138a427524f9124386e0e092e9c4dd5ac9aac
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

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 https://synerhu.ru/uplcv?utm_term=formula+of+unpaired+t+test PDF link annotation
    • http://paneldeconsos.com/userfiles/file/13635296647.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/lofutowinexofonumumirupo.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/82213819110.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/61150249978.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/70867044104.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b78b46b2d276b8b92e0e5e4963757847/tatexaxesa.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/diwozesasezikemazif.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/nogirafudaveg.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/milibevewugalimiv.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/93328169135.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/boxerepa.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/biwokuzemubaxojebodem.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/pabolixizinuvuxatowamogo.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/27157244155.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/xupudesejupipizov.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/91206622342.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/60875811455.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/38596379986.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/junefojofit.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613257da68902---84097088405.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/81911872923.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/95270981978.pdfIn PDF document text
    • http://besteva.com/upload/files/42699552824.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/selamuwemesa.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/19338479960.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/7870574999.pdfIn PDF document text
    • 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_off00014599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB0 10736 bytes
SHA-256: a5fe3b89fdc615bbc093fe3348daea3f6a0646a90f55fb3789d677fa92faa9fc
font_02_sfnt_off00017648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17648 20820 bytes
SHA-256: bfd4776b59baae1b0bc636086f7fed1dd17cbf40c216fd432fca12989560470b