Malicious PDF — malware analysis report

Static analysis result for SHA-256 f232666801332948…

MALICIOUS

PDF

76.6 KB Created: 2021-09-12 14:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 34f3d4b451911ed972d948b44e1cbd40 SHA-1: 6036fda53cbad14842bd3007eeedc439883e5725 SHA-256: f2326668013329483432f46679167325762c263c2e885ffb99ddb730436d1151
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 numerous distinct domains, many of which host further PDF files. While no scripts were directly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://olynskiconstruction.com/pics/file/nanekekatowenilegivop.pdf In PDF document text
    • http://anpharma.net/upload/files/30897550074.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/52043226371.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/mogiwajugerajutipavi.pdfIn PDF document text
    • http://shahgrp.com/uploads/73509448456.pdfIn PDF document text
    • http://tochalco.com/uploads/files/laxulutu.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/zarixup.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/bojasetosuzu.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/vakirokazapemox.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/zupusak.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/kesopamib.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613c311342d55---76412276824.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/3757596620.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/kosinelivevesotape.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/20037586061361f0188b9f.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/bapodoxugagoginodaxurafiz.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/fifugojitikejiwimaridora.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/xububaxomugar.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/kamesu.pdfIn PDF document text
    • http://sartor.ru/upload/files/64548692947.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/66560861846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=driver+ps1+apkPDF 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_off0000c4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C0 19108 bytes
SHA-256: 3561e2249af40cf33ac49822ec8247c876dd03ef367fd398fc686b263c44246f
font_01_sfnt_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 10088 bytes
SHA-256: 54c7bd4fb4f1ce786e11477f887b40a757bf296c887a891a964269f12950450d

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