Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6187bbb65568e74…

MALICIOUS

PDF

76.6 KB Created: 2021-09-15 19:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 41dfee63d68ae0d03c687baa65277a14 SHA-1: 5db18cfa7e0bd386e61609e8d9183e342a30214d SHA-256: f6187bbb65568e743f9eed86ad47ce966cfd10f037c12c213f584cf69c42abe6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=how+to+reboot+android+box PDF link annotation
    • http://permanentnimakeup-brno.cz/userfiles/files/98386881987.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090901375073499.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/wexexevipitudarixabisir.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/i04omkgvrcnh8sd2b2h4jndvtq/11593906340.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/vimaxalogururajazaj.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/19165258459.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/786bc49a7dc607040b0beee3e5ab23f2/woledibuta.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/lisikelatipulikopo.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210901/file/39472010306.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/28610053989.pdfIn PDF document text
    • http://infosierra.es/images/editor/3687789896.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/73029173924.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/90310943695.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/gutimavuzasumovonuvok.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/fapopevaj.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/43313362069.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/raxonorerateriwale.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/13485423302.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/89081259336.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/ziwiporulenebaj.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/gurolobubokobugisamuke.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/rotuwife.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/50386193246.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/wadodavifukipizagubewobu.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/88748415690.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/xitapafavijuf.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_off0000c519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC519 10348 bytes
SHA-256: be5253aa2376b56a260329d723ae732046048a1e59b1446c78f834b67aa3a5b4
font_01_sfnt_off0000dc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A8 18636 bytes
SHA-256: dde9567b70d8390debc88674a7ce7ca45044b872460b64ad24a6315e0a2d8a97