Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bee4c9b292242b…

MALICIOUS

PDF

77.3 KB Created: 2021-05-16 16:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2eb8622289b7df90479fef9b108c6f59 SHA-1: 77dc7592c3ebcdb9d8a958ffe62fb8cec65a7203 SHA-256: 64bee4c9b292242bfd94bc5d2d44beaffdd5ffc20f53ffba19b9e8c02e8a093c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/strik?utm_term=where+do+i+find+my+pals+certification PDF link annotation
    • https://fulugive.weebly.com/uploads/1/3/0/8/130874350/5cae8a8.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/8idwjaN/cookie_helix_smash_download.pdfIn PDF document text
    • http://pakaxofuj.sportsontheweb.net/air_cooled_condenser_design.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/biology_mcq_questions_for_class_10_with_answers.pdfIn PDF document text
    • https://modefijibig.weebly.com/uploads/1/3/6/0/136011483/1bbe648fc74.pdfIn PDF document text
    • https://dolibaradodusop.weebly.com/uploads/1/3/4/5/134595809/3d998a019.pdfIn PDF document text
    • https://lezolofajikop.weebly.com/uploads/1/3/4/3/134353880/dotapetat-lixutevudowi.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/7jggcPR/11th_chemistry_guide_download_2019.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/8836263.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwojeta/agjggie/94255999400.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d53386e-10e7-4de2-b509-b2668bfc0a27/how_much_is_a_wii_trade_in_worth_at_gamestop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3532c61f-b3c3-4671-91b6-20e7bd897a73/fikejanoluga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbfe1c28-dc5e-4e8f-b3af-360b81002f80/30789522475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f9fb65-4a41-41d1-8bd5-dbbd2d90646f/nejimululikuzipuliv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4061b9b-abe9-4e89-9f97-e852195d3e60/34833689476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/214d299c-b6c9-40b4-ad90-9008e47ef9b6/grohe_kitchen_mixer_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f08a5ad-9cb8-4c65-9e19-54917d1a940c/30759591590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4caeb073-af7f-4d79-a6cc-1336483849fb/how_to_reset_heater_thermal_cut-off_on_hot_springs_spa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72ef6814-dd53-4220-aebc-a7938875ae72/50834188833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f35adc85-330c-4beb-98c1-02a13862e06a/kofematipajefoludakugugi.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_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 5508 bytes
SHA-256: baedd17c99e43107f759dbb47631636a5f29e4512ff504d8541b0428e39d5736
font_01_sfnt_off00010203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 11128 bytes
SHA-256: 0ed319410e3fa28200e711c74d77f68cdebcf2e593f5f290b8f3b43ee385ade3