Malicious PDF — malware analysis report

Static analysis result for SHA-256 4500ba1f8c05930b…

MALICIOUS

PDF

70.1 KB Created: 2021-03-03 01:41:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 53b3615576cf4f9097d0f3a2d01a1dbe SHA-1: 568e0af683183be717a54583a3a70ac56cf57f71 SHA-256: 4500ba1f8c05930b91dac0709742a755fee0ae41447d8efeb6f933c93920aa9a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs disguised as links to book downloads, with several heuristics indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=the+real+book+sixth+edition+eb+pdf PDF link annotation
    • https://polatubogo.weebly.com/uploads/1/3/4/5/134598163/supixetemab.pdfIn PDF document text
    • https://nimifitirujaga.weebly.com/uploads/1/3/4/6/134693460/takilimifatozud_texizokikobobik_wedabipizato.pdfIn PDF document text
    • http://sudejiw.22web.org/40652686571.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/CxlgjPB/46112387102.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/hcgijdQ/95434846349.pdfIn PDF document text
    • http://roworesezakor.iblogger.org/nozosaxipaxadisazopiw.pdfIn PDF document text
    • http://fasumidivojasuj.iblogger.org/pumiferizamudukikubige.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/Iieiggi/beautyrest_drifton_mattress.pdfIn PDF document text
    • https://berekiba.weebly.com/uploads/1/3/1/4/131482976/58f4da7.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/where_to_donate_clothes_for_homeless_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tanitiluwisiso.rf.gd/limapaxufitalafez.pdfIn PDF document text
    • http://paxubar.rf.gd/loela_drakel_anggur_merah_2.pdfIn PDF document text
    • http://wozimape.onlinewebshop.net/61467939666.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FA 5348 bytes
SHA-256: ad7312aba8f79749bf2102be2a6a83f9be7f7bec2761fc9a90266abed97e20e5
font_01_sfnt_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 10580 bytes
SHA-256: 8e1b4869dca9145fdd44fa6727363e22f5e3811d3577c605c5026b3dfa80dfda

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