Malicious PDF — malware analysis report

Static analysis result for SHA-256 252959f649c59481…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 00:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ccb7e02b12078dcd2462197f91de97b1 SHA-1: 47fd1d0fafe52caeaa4668aa1d4fd8549c87ea77 SHA-256: 252959f649c594815ae29dc31b32a13d268c7610bd9ea92fdb9c158715e491af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or distribution network. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://best-of-geldanlagen.de/userfiles/file/zazesopodafa.pdf In PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6972eb87e---21782556980.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/32206321464.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/kegalutidatolopef.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/15438930664.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/nogurokujivugopesidil.pdfIn PDF document text
    • https://magic-ray.shop/uploads/files/73098963649.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/ximubufakanudemox.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/pabonuwokomitusaribakete.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/koxubufasupanavozavib.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/fotes.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/435eca84afc0829ed3196f4872487699/80224580192.pdfIn PDF document text
    • https://sino-islam.com/upload/file/220729331741.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/86975135287.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/21902930425.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/28497047525.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/segogavenodu.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/18716155534.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/26733642829.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/32390821286.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/15511169522.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/nogesibofanowegeb.pdfIn PDF document text
    • https://topupdana.com/contents/files/67987530351.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/rodajugabogoxozugafi.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/23449066535.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/zeruwofazafutij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=avengers+endgame+online+watch+freePDF 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_off0000b534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB534 11056 bytes
SHA-256: aed4e13b57a6aebb9574a8cc4dd32ef689fa7506d7a08510eb963d6c94154ddd
font_01_sfnt_off0000cea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA0 14812 bytes
SHA-256: 54815fda48fc19cd77c095b72b82e34db2c6fa5eb79bc2f97ab657ea26b3b4a7
font_02_sfnt_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1