Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a9dc6283564287…

MALICIOUS

PDF

70.6 KB Created: 2021-09-17 09:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4bffce0a80ec8134e9639fcd90db4a0b SHA-1: 653c96d975366f842077b4cca9225d6a5bb0f402 SHA-256: e9a9dc628356428796174599376f57faf461cce07bfaba5b7f31cf5baf779c39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains a large number of embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The primary function seems to be directing users to potentially malicious websites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://drafthe.ru/uplcv?utm_term=what+channel+is+boxing+on+tomorrow PDF link annotation
    • http://aroma-es.red/yamituki-n/uploads/files/83427757983.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/83056419325.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/30015916036.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/32241878041.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/daccfcc62bbfb8765305e9535bfe916c/16600557706.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/tukukikatirebokesipota.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/vebewobirepom.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/roxixugowemibolevife.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/guxunavumavax.pdfIn PDF document text
    • http://odumakus.com/uploads/files/xixivusisaxef.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/82005825783.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/63977399432.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/40890966656.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4676c9b36---nubizigaluw.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/6710823474.pdfIn PDF document text
    • https://x-software.cz/data/file/95579705784.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/70016793764.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/14645651789.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/wamovoguzabu.pdfIn PDF document text
    • http://nemochem.cn/upload/files/49288538461.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/linalade.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_off0000b2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADE 15936 bytes
SHA-256: f359b1d9b9df0b349195177ba144b791e8c8452c66bb3b704f64c96c743802ab
font_02_sfnt_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 10996 bytes
SHA-256: 20b62e8d51cbfee557d815202295accd08a6a137ce0633e8c5239d4003951796

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