Malicious PDF — malware analysis report

Static analysis result for SHA-256 98dc278efa97fcb0…

MALICIOUS

PDF

76.8 KB Created: 2021-09-24 12:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46b6855be92cf6866ffefda19a5449f4 SHA-1: 4dca5262561fb6e8fea2d3ae47eb3a59bdc637ab SHA-256: 98dc278efa97fcb022b54ae4a5a149594bcb1caa9c341c72cca0bd1df063da7a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

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://joyear.com/ckfinder/userfiles/files/5424241026.pdf In PDF document text
    • https://s-h.cc/uploads/files/202109130321324984.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/wufabagogepuminukukiwixe.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/68602349298.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161416251c3367---mozapel.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/81379313715.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/82294054142.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210915161157.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/84869373693.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/gibetafagoropabeluxoxiz.pdfIn PDF document text
    • http://land89.com/ckupload/files/regigot.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/81906513524.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/wudoresezugopibanokurig.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/jodutafosebexugaw.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613222f593763---26039262279.pdfIn PDF document text
    • http://aromata.ru/upload/files/wowedepovagetilugos.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/7558212890.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/71295074045.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/97718835713.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/boxutalejovelidedu.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/46886033174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=redmi+note+8+mi+account+remove+chimeraPDF 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_off0000b9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CF 21664 bytes
SHA-256: 508365c2f78992225120304730bc2ac16ee03808f8f6de624f327eb8ee4441bf
font_01_sfnt_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 10840 bytes
SHA-256: 1be583b351c000c104ada860db69523761b17e85b95fc715ffcde191d826939b

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