Malicious PDF — malware analysis report

Static analysis result for SHA-256 d152c72a8554dac1…

MALICIOUS

PDF

77.8 KB Created: 2021-09-11 10:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a5798a4e50230313c0d0c2290e7f49e0 SHA-1: e07ac64efec48d8da6440538715e275d9f6936fb SHA-256: d152c72a8554dac1bf0a8fc3d2383302aa251c58a1bb59c58b26fabc69531995
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to manipulate search engine results or distribute further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://cpk.by/ckfinder/userfiles/files/vilikalenudamo.pdf In PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/49804940634.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/telenusoxanivo.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130afabb2758---rezawubevaw.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/92562269372.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/43989077164.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/zenarojovadodugi.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90a9bc944---23299750138.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///gexulelususodujazelun.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/mapatixezavejijipujoj.pdfIn PDF document text
    • https://svltv.in/userfiles/files/kovelufalujovezibesuzisev.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/bufatibinasinusijum.pdfIn PDF document text
    • https://tomas-music.com/contents/files/71168993990.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/zasezezam.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/9318886446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=harry+potter+puzzles+%26+spells+mod+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_off0000cc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 10316 bytes
SHA-256: 33e295262fe025b7fcbabea0e6a451300831146b40b03afe0c192d285ad9cc82
font_02_sfnt_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 17964 bytes
SHA-256: 60405efd2c351b2a15f3abaae66ae6197c1c23b63247dcf7d76f3ac7eafe436f

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