Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2ec5f789770d50…

MALICIOUS

PDF

74.5 KB Created: 2021-09-18 22:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f0d6c709d1e492b63fcb6182e58b5313 SHA-1: 0cdef1d2e7697d8513058307cb6ead19c9d7fae8 SHA-256: 0f2ec5f789770d5021b97a5963793196650cde681c86c539bd7dae5a260d6109
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains or are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=glucose+molecule+diagram PDF link annotation
    • https://hamayeshniroo.com/shop/file/42806870135.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/guborafuro.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/83746755614.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/bapogowogimepavedu.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/dbe39dae16df3835a42e10074e70f397/11265331585.pdfIn PDF document text
    • http://cosyromania.com/media/file/fupazivikepevodu.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/ponoxu.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/5125080873.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/kalimunutubowafuku.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/wesuluxogiwadomikewek.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/zumomizoduzi.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/54060202166.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/4693629416.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/molizefeto.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/lodemuruxepalujosikebis.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/58627687737.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/vudojololikuzopug.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/ramakefivazojagajet.pdfIn PDF document text
    • https://servicio-mexico.com/images/file/wodevasububegadekokimaj.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/ledajusop.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210910_D863A60F59B56031.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/vugasegojowogabibamo.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/lexiwani.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_off0000c17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17C 16604 bytes
SHA-256: b26295f902b4b6c8ffb8e48051a3732bd23b906833a2905a189fcea09b4f276a
font_01_sfnt_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 10648 bytes
SHA-256: 851f8d948fa232604f22a6f0f4d336122f903a002555ef3af328d667e16dff0b