Malicious PDF — malware analysis report

Static analysis result for SHA-256 7189c4d0ba96de17…

MALICIOUS

PDF

73.9 KB Created: 2021-09-10 16:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: de08f4d27ed91fcb49830377fe395e83 SHA-1: 6ca4589a63d472b30ab4510ec8b2619d6106771c SHA-256: 7189c4d0ba96de170521a6528f4c03ce1d2afad715c4a1c86f090c156262a59b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are on disposable hosting and utilize UTM parameters, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and external URI firings point towards a malicious document, likely a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=raj+tv+serial PDF link annotation
    • https://hoangvan.vn/wp-content/uploads/files/64356631559.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/64325638036.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/5968619536.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/43723590347.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210901163049709577.pdfIn PDF document text
    • http://ropesadventure.com/d/files/15884220156.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/sefukexaxanajulegademi.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/37291451549.pdfIn PDF document text
    • http://travellerisland.com/files/33898927956.pdfIn PDF document text
    • https://satesayap.com/contents/files/mizevavonalexibixeji.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/wewulotezaxeko.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136caebd1d25---51248060487.pdfIn PDF document text
    • http://venkateshservices.com/uploads/pijeg.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/dc28l7n90idk2hl67etvmib0ho/jeturisonopevitoru.pdfIn PDF document text
    • http://bushurov.ru/images/files/94344333051.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/88566305769.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/bizibugidemesiwop.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/selelituzudanuzubedekefos.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/91412889746.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/muxiwekibepavepega.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/79685042391.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/nofelaxixutasasuguzawo.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/wewitibamijukofololubo.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/9319380231.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/46886490337.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_off0000bc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC56 10120 bytes
SHA-256: 2a6b5849c5a011e0deb141d5a1e8f6093a60c659148fd225cee8be8f7e6490e3
font_01_sfnt_off0000d30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30A 18808 bytes
SHA-256: 1777ce7b8296f432e4015f356c703cb1e032642bd25ff5ce8ae84ca85bc702fc
font_02_sfnt_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1