Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c5c952b8867615…

MALICIOUS

PDF

68.7 KB Created: 2021-10-06 01:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 962df238ca0397d3f9ff16a0b8809fdc SHA-1: 965a29631f644967501b78040737ac978f56a41f SHA-256: 11c5c952b886761507f595061f0f7e575ffddbc8e07ffc949dede11246ab2e54
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 a link farm with numerous distinct domains, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lure users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bruceautoservice.com/files/file/37687242534.pdf
    • http://33podarka.ru/pictures/files/gurugosiwotilawarok.pdf
    • https://noclegsosnowiec.pl/eurostyl/photos/file/taravulekudavimuk.pdf
    • http://cokhihoangvinh.com/uploads/userfiles/file/28527641258.pdf
    • http://primeasset.hu/fileok/file/merireronerajodoto.pdf
    • https://olamare.com/img/uploaded/file/36685654222.pdf
    • http://nfc.soo.jp/file/gidanigexu.pdf
    • https://nutstudio.it/userfiles/file/8535028144.pdf
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/72009920500.pdf
    • http://maychaybocaocap.com/app/webroot/uploads/files/lovubotu.pdf
    • http://madinaboys.com/easydo%20v2.00/files/uploads/89170360863.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/g13bqrjobpjh5u6rm5h3618h5l/82345476557.pdf
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/11915210280.pdf
    • http://bidadapatidar.com/userfiles/file/99660646542.pdf
    • https://printsolutions.ro/uploads/wysiwyg/files/23429921502.pdf
    • http://gordostcrista.ru/userfiles/file/17876418675.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140154957ce9---11153372659.pdf
    • http://www.de.ruben.pl/ckfinder/userfiles/files/7283779817.pdf
    • https://mapithanhcong.com/upload/ck/files/40023754654.pdf
    • https://shreenathtechnologies.com/userfiles/file/91454602596.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=dc+shunt+generator+solved+problems
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b05e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB05E 16792 bytes
font_01_sfnt_off0000c870.bin
fbda2bf9d9ee43bdfb9c6ef52fe2afb94e4c1896ee621d8c5958dac3882f680c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC870 14344 bytes
font_02_sfnt_off0000ec04.bin
7b4cc92e741e8ad649a0369eed298ff9a899f03a3bbc6deee760607687e57820
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 11176 bytes