Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6dfbc3388e7a4a…

MALICIOUS

PDF

86.7 KB Created: 2021-09-14 15:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29aa16a3bc23558be7d063a0a8ed6ceb SHA-1: eee71a9c0e924c913d632e8a5c5212c0947c2322 SHA-256: fc6dfbc3388e7a4a9b9bcb2b096318da581b5cd31a37a80a4b08f8d8a79d1ee6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple unknown URLs, one of which is hosted on disposable infrastructure. While no scripts were explicitly extracted, the PDF format often utilizes JavaScript for malicious actions, such as redirecting users to phishing sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/19421083822.pdf In PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6a7c77a97f62c4ec688872cfbfd1e13b/mumetatuxuxifewuje.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/zapaselesexax.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/lolazuxafilesid.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/dofibavakabofanozen.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/rabisa.pdfIn PDF document text
    • http://wami.cc/data/files/80132898451.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/19006883035.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/tesedebemixapiwodiden.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/gemezewepurejuxizojabi.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/birulunu.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/zumosivovumobenexosumo.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/lodaz.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/fdc9aefb80ac989895bf4a7d064d2c04/68045010972.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/jemogazuwufijixinuko.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/68382807417.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/pujematulomunarikimarezo.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/pemama.pdfIn PDF document text
    • http://hydrem.ru/images/file/bedowenedirogop.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/70304072279.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/rawiwizukijodewenob.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/wesirajijuxurekof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=being+wrong+kathryn+schulz+pdfPDF link annotation
    • 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_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 18876 bytes
SHA-256: 62b5a130a38b7cabc732a41b4c9e1e8d67aae4977f8fd0c98ba045574e66ad69
font_01_sfnt_off00011a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001324e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324E 11404 bytes
SHA-256: 4b171e6bf453872da185c65e79d09ffc03c47f7431bf00077d8b2dcbddc9c09f