Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d2ea4e69de5b84…

MALICIOUS

PDF

75.3 KB Created: 2021-03-27 15:08:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: caea7209e583c8c2c548317e107f66b8 SHA-1: 47bfc4a4f2475c880a998f0d8d55358d7b4f8547 SHA-256: 43d2ea4e69de5b84a3766f2adf38a574f5bebd6726e0399a1f6e1ba79ecec9cf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a deceptive lure related to a book search, directing users to potentially malicious sites.

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://nipisod.ru/award?keyword=bayesian+data+analysis+gelman+second+edition+pdf PDF link annotation
    • http://xanejog.medianewsonline.com/ramayanam_sundara_kandam_malayalam.pdfIn PDF document text
    • http://4gusevshop.website/31590210426rdtbb.pdfIn PDF document text
    • http://bupro.asia/21574126386jshpr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_605d79dada775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_602eea5b55d82.pdfIn PDF document text
    • http://yatvoyya.fun/dipalogodutujanrxa4.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/58838974532.pdfIn PDF document text
    • http://ooovseanalizi.ru/808817564301rife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476924/normal_60353ab243792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387406/normal_60260c1a07952.pdfIn PDF document text
    • http://trudogoliya.online/22713037437u2561.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/iukiijd/36556639763.pdfIn PDF document text
    • https://cdn.sqhk.co/dilobowuz/ggpigMo/california_dmv_vehicle_registration_renewal_form.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/pdf_file_sample_free_download.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://somasetowijo.myartsonline.com/pdf_to_word_converter_online_candy.pdfIn PDF document text
    • http://dafukip.myartsonline.com/62471734004.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/rosuxinitofagiwo.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_off0000e84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84C 5532 bytes
SHA-256: df972c50d6d8fe06c13a322809e784c0afa1496d7fd0aa19fbdf78e3d6976d1c
font_01_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 10696 bytes
SHA-256: 467dabce3798dce008468fa72fc3b9f9ac435e0e1109150df708568150487a7e

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