Malicious PDF — malware analysis report

Static analysis result for SHA-256 998d50801c724399…

MALICIOUS

PDF

85.8 KB Created: 2021-04-04 18:39:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 454316d10d68078c51b9baece675ab8d SHA-1: d629ab4e795dc7a2dfc27d1b459b8ffce19cd869 SHA-256: 998d50801c724399fe173e505d9a3a17b74bf268bc385fe2d2f824c1461f85cd
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/award?keyword=best+self+company+pdf PDF link annotation
    • http://nawemofukewo.medianewsonline.com/91312069198.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/how_to_calibrate_kitchenaid_oven.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/mixing_methods_qualitative_and_quantitative_research.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481282/normal_603484a2c39ea.pdfIn PDF document text
    • https://cdn.sqhk.co/zifakepavax/N6Eibih/pokimibe.pdfIn PDF document text
    • http://finoginujowiwi.mypressonline.com/calibration_of_temperature_transmitter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_5fd7c7a02c95c.pdfIn PDF document text
    • https://cdn.sqhk.co/xenojepezere/hc5OgiU/33004628530.pdfIn PDF document text
    • http://wunuvuzixuxi.getenjoyment.net/chaus_english_speaking_books_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/hhAIgjN/terrablock_insulation_price.pdfIn PDF document text
    • https://cdn.sqhk.co/remozemot/3gdjdLk/ladeneberaxuvez.pdfIn PDF document text
    • http://rekugegik.scienceontheweb.net/technical_terms_in_computer_science.pdfIn PDF document text
    • http://bisipatelaloguj.66ghz.com/pagigakeweduvipig.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/65822813438.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bafuwujix.atwebpages.com/ccht_practice_exam_2020.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/designing_data_intensive_applications.pdfIn PDF document text
    • http://dolanuvusipegu.myartsonline.com/63313407499.pdfIn PDF document text
    • http://vudalulok.rf.gd/20965167604.pdfIn PDF document text
    • http://xesufarojix.epizy.com/23458596100.pdfIn PDF document text
    • http://gavawekib.myartsonline.com/addition_without_regrouping_worksheets_for_grade_1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001011f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 5096 bytes
SHA-256: 98862a927c7e3a7b1cebf36be2513de9243b0bb1ee00d8dcadd8113fc33772cf
font_01_sfnt_off00011266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11266 12684 bytes
SHA-256: cf7e46a13a08df3ee7b811610d8f9638805a8dcfcad7574b49c956746254eb4f
font_02_sfnt_off00013bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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