Malicious PDF — malware analysis report

Static analysis result for SHA-256 767e5e0d79c8bcb2…

MALICIOUS

PDF

79.0 KB Created: 2021-10-07 08:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 534083c71310ce5138b786ac8c577d14 SHA-1: 7fc132fe0d068db5899f02e24f94d3d278eef101 SHA-256: 767e5e0d79c8bcb2d273ce17e8cde42f5587d658fcdd5289c7d1a65a814ca14f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The sample's structure and URL patterns suggest it's part of a campaign to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://15449010.com/FileData/ckfinder/files/20210919_231CDD3AC89D990C.pdf In PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/64900449475.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/kijetujotelav.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/cf4154100a9e6f4a424a3323e698da25/suzuxifubamujojulo.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/sewomotogekiruroron.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/253072959.pdfIn PDF document text
    • http://4bx.pl/public/file/7971165970.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/55531503999.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/dufom.pdfIn PDF document text
    • http://www.pilartangguh.com/file/gupamuvudukowawuxu.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/65514363621.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/rirajotolibiligulom.pdfIn PDF document text
    • https://greenlakecruises.com/ckfinder/userfiles/files/11735763853.pdfIn PDF document text
    • http://ymmicro.com/files/files/minopetufotevimovuduz.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/maregiwojapamametu.pdfIn PDF document text
    • https://reha.bg/content/upload/file/66107220548.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/basexudovukirid.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/91856552560.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/lovivomarux.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/67073908340.pdfIn PDF document text
    • http://kvrhousing.com/uploads/26410504816.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/77883871342.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/75745952366.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/57518113701.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/gesizima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sore+head+for+2+daysPDF 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_off0000d3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E6 10420 bytes
SHA-256: 97db755e23a4ad706ef1e52cf278c50b8e0a9e2fc5c2cf3883ab0b252413682e
font_01_sfnt_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 16952 bytes
SHA-256: 30ca2e304092dc64b52e33b3e5a6e8f73fe3bee40a523c809185b81e1b856285
font_02_sfnt_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1