Malicious PDF — malware analysis report

Static analysis result for SHA-256 4529de9fe25de3c6…

MALICIOUS

PDF

88.3 KB Created: 2021-03-22 06:14:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 8e39377484e4f8d1834752f48727538d SHA-1: f472857889da64c336fb30140c3db69a99685609 SHA-256: 4529de9fe25de3c6d60ccdb5fb18bf12f961b7312acffa6189371ee4bb273d83
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a disposable hosting domain, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure strongly suggest this PDF is designed to redirect users to potentially harmful websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/aws?utm_term=top+10+news+of+2020+in+india PDF link annotation
    • http://rabejagoruwobol.66ghz.com/kindle_weight_loss_pills_femme_forme_reviews.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463792/normal_601598e11839d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392218/normal_5fe82c773b3da.pdfIn PDF document text
    • http://lepawumu.22web.org/kezawez.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/gi6FJhd/thubten_chodron_buddhism_for_beginners.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404308/normal_5ff78f1b2f20b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489992/normal_60166d976580b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402519/normal_5fd7c01d5158a.pdfIn PDF document text
    • https://cdn.sqhk.co/gesaxamadew/e8Gjg8D/coji_robot_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411702/normal_60052f7e5ae92.pdfIn PDF document text
    • http://momarivido.mypressonline.com/56812107512.pdfIn PDF document text
    • http://mizafaroremida.getenjoyment.net/requirement_elicitation_techniques.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419846/normal_5fc622a036dfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454677/normal_6046e71c0295b.pdfIn PDF document text
    • http://xirenunelozi.22web.org/95912800903.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460055/normal_5fd22637e902d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389794/normal_6032bfdc7bd97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://genolewedusu.myartsonline.com/ethical_conduct_in_the_workplace.pdfIn PDF document text
    • http://lufubapiworozil.epizy.com/banking_and_finance_award.pdfIn PDF document text
    • http://gajedimigifupet.epizy.com/lapewawireserulemamib.pdfIn PDF document text
    • http://labinugekifuv.rf.gd/fovunejijat.pdfIn PDF document text
    • http://wuzorijo.rf.gd/leaf_anatomy_diagram_answers.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_off00011af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF3 5272 bytes
SHA-256: 55a42459f694c87d7fe0f20621cd243652a0f97be2827e4c08fde656c41fd5fe
font_01_sfnt_off00012d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D17 11024 bytes
SHA-256: 3c48e6201146439d0e55fdcfea4099feb0f416bec316dbde1a558cfbba7a4101

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