Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d62bdd30f8aabff…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 22:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0b95aebcd7a7860dd4d14b5637e57d47 SHA-1: 5460c8bff886cbc3a5b0bd324a695df544f03586 SHA-256: 8d62bdd30f8aabffac54ce014d8125ec7323d49c2c7e3346d2dd7ab8f5fd1951
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=download+super+mario+sunshine+64 PDF link annotation
    • http://euro-ex.com/images/blog/file/14571620141.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/25005362349.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/tazen.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/xemil.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143c55bcb9be---41273482274.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/jifin.pdfIn PDF document text
    • http://pferdplus.at/sites/pferdplus.at/files/file/16083946981.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/pubavetejufo.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/82260112255.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/18267900903.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/susarufaguvenivisonexojab.pdfIn PDF document text
    • https://orrizon.ru/images/file/92221653839.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/99011152657.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/68725084899.pdfIn PDF document text
    • http://telektrans.hu/editor_up/dufov.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b5a78979d---vofepufijozipinozafaso.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/titazux.pdfIn PDF document text
    • https://coil.hk/upload/files/gozulusokawazunixerizowut.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/19595282172.pdfIn PDF document text
    • http://egitara.com/upfiles/files/nomebapelowixakifa.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/karizevobi.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/28342837583.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_off0000d590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD590 10992 bytes
SHA-256: 7b5bfd70bb8ef1d3fb4444b394c0c2a3b0f975e35d6c82af0d42f80af208b7bb
font_01_sfnt_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 17596 bytes
SHA-256: 52ab78d41196dfe02d9296f9c7e47c5485793fbd186a85245eb3a15d095d5a76
font_02_sfnt_off00011c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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