Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb4daafa11cbadb…

MALICIOUS

PDF

89.4 KB Created: 2021-09-16 06:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e53fd5197a5fc30f976a746f45b8963 SHA-1: f40128def37997e7c36c156b59d02d3d20730904 SHA-256: 0cb4daafa11cbadb4e739ee61f628f7d692908986c8a9af43cedee7ed38b320f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a likely attempt to redirect users to malicious content. The presence of multiple external URIs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=m%E1%BA%A5t+thanh+tr%E1%BA%A1ng+th%C3%A1i+android
    • http://dobermanncz.eu/files/55525077010.pdf
    • https://stmarys-perthamboy.com/upload/File/56236561967.pdf
    • http://nexxosrealty.com/userfiles/files/kexudusebudizapowotukosej.pdf
    • http://xiangzhuan.tw/upload/files/12247035157.pdf
    • http://vinhomeshaiphong.net/app/webroot/img/files/96364414996.pdf
    • http://primaneighbors.com/userimages/zatavomodobovawa.pdf
    • http://anapharmata.hu/ckfinder/core/connector/php/files/pukazivaxejivejale.pdf
    • http://missteenqueenuk.com/userfiles/file/kizip.pdf
    • https://calprin.com/ckfinder/userfiles/files/mefeze.pdf
    • http://www.larche-de-jules.fr/ckfinder/userfiles/files/90440958253.pdf
    • http://lahma.pl/_u/userfiles/file/dijowosobefomose.pdf
    • http://saiprogetti.net/userfiles/files/wofudeninusopetenogof.pdf
    • https://vandolderskb.com/images/usr/tosujemimo.pdf
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/mesakabix.pdf
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/42107224836.pdf
    • http://eltdb.com/UserFiles/files/nobufawapubofikizexaxone.pdf
    • https://5udua.com/contents/files/winenipesoxexuro.pdf
    • http://uleshuzatshop.hu/files/file/tekalewajupugurovul.pdf
    • http://designklasse.de/ckfinder/userfiles/files/96614821979.pdf
    • https://abcoegypt.com/userfiles/files/xujuwagiwowobejas.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/0f5e862f92194feb8113855fbbdcab43/66113752817.pdf
    • http://saigonradio.com/userfiles/file/bunezad.pdf
    • https://mrpressconsulting.com/UserFiles/file/43986268399.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0b6.bin
060c0472518b6c65ed151a1f272046737d338d0a7d79066a5393cbd7511786d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B6 16508 bytes
font_01_sfnt_off0000e6e2.bin
be1191ef3ee93269fe42cc1232b6e9484d88a5e77324c5a3b48a87993378d87d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 28380 bytes
font_02_sfnt_off00011dea.bin
f495f66cdcccc11b387d2cdfec576775041d022d8a4b0d4f9c5a161155d042e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEA 10772 bytes
font_03_sfnt_off00013526.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13526 16792 bytes
font_04_sfnt_off00014d33.bin
6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D33 1692 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.