Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfe61705edac300…

MALICIOUS

PDF

101.7 KB Created: 2021-03-18 12:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b291704c958e634d7f2aebcf1589866a SHA-1: 1a84ba9c161c97e0a0a6e8706fa3e6d25154b334 SHA-256: 2bfe61705edac300b382076e166646b9e0b402a9444d038fe104fdc36335d2a4
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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://seumenha.ru/award?keyword=cardano+s+formula+pdf
    • https://cdn.sqhk.co/diruzatojep/gfhb0od/summaries_of_constitutional_amendments_worksheet_answers.pdf
    • http://jilavixit.medianewsonline.com/tuzadevuduzawoxoruj.pdf
    • https://cdn-cms.f-static.net/uploads/4491669/normal_6018a70e45b75.pdf
    • https://cdn.sqhk.co/siviraboriru/gftjb5Z/28116944337.pdf
    • http://zotoxilob.getenjoyment.net/star_wars_ahsoka_book_barnes_and_noble.pdf
    • http://levotavo.scienceontheweb.net/plot_diagram_of_dr_heideggers_experiment.pdf
    • https://cdn-cms.f-static.net/uploads/4409421/normal_5fd17386d200f.pdf
    • https://cdn.sqhk.co/vebiziwob/FG6hehi/sharpen_blades_near_me.pdf
    • https://solebuza.weebly.com/uploads/1/3/1/4/131453496/11824.pdf
    • https://static.s123-cdn-static.com/uploads/4454301/normal_5fc6ad0c2b37b.pdf
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/f84ad19402.pdf
    • http://sozaxesugoj.mywebcommunity.org/49062079747.pdf
    • https://woteginawewe.weebly.com/uploads/1/3/1/3/131379999/famimikafumuwa_nodime.pdf
    • https://cdn-cms.f-static.net/uploads/4500001/normal_60349f99957de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0fcf1670-0ad3-4ed1-9024-11d692d1da82/48016654321.pdf
    • http://wikukodukoja.onlinewebshop.net/technology_acceptance_model_definition.pdf
    • http://forojiwimudobo.atwebpages.com/how_can_remembering_names_improve_your_social_skills.pdf
    • https://uploads.strikinglycdn.com/files/1a69c55d-3661-4b29-a5e4-30dac812c283/backbeat_fit_3100_volume_control.pdf
    • https://uploads.strikinglycdn.com/files/21416655-299b-4351-9c34-8b96b50ae477/1_to_100_000_copy_and_paste.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000137b1.bin
f3da9dfdf0495db6a9fabe4b60aad7ede631c0b332287268bddd3d42f105b0cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137B1 5092 bytes
font_01_sfnt_off000148e6.bin
8bfb210624f51773541775ec1b882c04a7aa642f75d3c87a76ef80029b52c4f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148E6 13568 bytes
font_02_sfnt_off000174dc.bin
52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x174DC 16036 bytes

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