Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15e8ef163ce2c62…

MALICIOUS

PDF

77.2 KB Created: 2021-02-28 09:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9fd77380844b433aaff615f6faf7d3f8 SHA-1: 7326e9125ac4db45211ce1e53faf0f4367188caf SHA-256: b15e8ef163ce2c62d7091d84be4bfb6b267bfc06de73ac114ab9c464e4609300
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lead users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/award?keyword=black+feminist+epistemology+summary PDF link annotation
    • http://mnclassis.org/cajamar_app_android9a3f1.pdfIn PDF document text
    • http://vykupavto54.ru/sukupofespaq54.pdfIn PDF document text
    • http://urro-hu.com/homophobic_meaning_yahoo_answersafrdm.pdfIn PDF document text
    • http://infokurs.design/98221063623fy4wm.pdfIn PDF document text
    • http://doorstepcomputers.com/35531168235seqd7.pdfIn PDF document text
    • http://mosasekoz.22web.org/wipavu.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/the_negro_artist_and_the_racial_mountain_citation.pdfIn PDF document text
    • http://brumbum3.xyz/27332991104oxb90.pdfIn PDF document text
    • http://groby-ritual.online/family_tree_worksheet_for_adultskowej.pdfIn PDF document text
    • http://tajavimisafom.22web.org/30587330905.pdfIn PDF document text
    • http://rozapunu.22web.org/rokitibolalepe.pdfIn PDF document text
    • http://itasummer.fun/winivariwijiditiperr74df.pdfIn PDF document text
    • http://nudistoff.club/business_management_chapter_17_quizletekbal.pdfIn PDF document text
    • http://btsworld.org/free_iobit_driver_booster_full_versionoi812.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xavisijividefo.epizy.com/73160691690.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A9 5432 bytes
SHA-256: 0227fefc22f3a30af37ef6bfdd5d1652e8aa603a1b96afc670045311efdc9625
font_01_sfnt_off0000f819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF819 9928 bytes
SHA-256: 9590f2033392427b5aaab51df1e286e8df9a6c5abfad13ca39a8238463a07fdb
font_02_sfnt_off00011a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A02 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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