Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ae6a60d34b7047…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 22:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a389846de6d937364564320e3a0480d2 SHA-1: a84ecec417ccf88d71fa628e69434b0caf09094a SHA-256: c8ae6a60d34b70474bcf9b89df162d9c905c613e2c26b9fd7265f0814462b8dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or redirection strategy. The PDF's structure and the presence of embedded URLs suggest it is intended to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://krisoc.ru/uplcv?utm_term=plan+b+android PDF link annotation
    • http://aqua4you.hu/userfiles/file/gisuwanamotiv.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/muvifinoferug.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/riret.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/vewof.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/39429422549.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/46865005529.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/88650782971.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/witijokolafimatogatane.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/69894946703.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/lumazefegajixawotonu.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/jopejisereguxut.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/8209306342.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/88673905270.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/39936288318.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/xowupanokukij.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/51802701972.pdfIn PDF document text
    • http://mamitobe.ru/files/file/61145493458.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/21770361090.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/99308347786.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/fapuxuwunelelavivov.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/42752223469.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141691f72c4a---37644734533.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/pasisipupajavijolezix.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/55637136838.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/70390913595.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135308c4afdc---domixek.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_off0000db31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 17604 bytes
SHA-256: 24c005cc89d2cf577142bd712a60ef9fa08aeaba31d81279093664051124a0d5
font_01_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EC 9984 bytes
SHA-256: 0cc9d5a2a7e43f013afe42e398bf78656fc8bdf79520416dac2bd7580e00c3a1