Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbd235d50faaaa2…

MALICIOUS

PDF

76.4 KB Created: 2021-03-15 19:11:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 18d1a22e6cc8018ba403f875de6bd1ba SHA-1: 86fb355cbb8bd16d0593e9efbb847a6aeec58a3a SHA-256: ddbd235d50faaaa26131daea9156a390df752e44f15663c0d15d48cbbb22b61e
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one pointing to 'vilenefex.ru', suggesting a phishing or malicious redirection attempt. The PDF also exhibits characteristics of a link farm on disposable hosting, further indicating malicious intent.

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/wix?keyword=vitamin+e+oil+or+jojoba+oil+ear+stretching PDF link annotation
    • http://luxomozuk.mypressonline.com/percy_jackson_and_the_olympians_book_characters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421330/normal_602876a34ec8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454287/normal_601f92bf7f4a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448332/normal_600909ab2273d.pdfIn PDF document text
    • http://joritirumag.mypressonline.com/heath_zenith_sl-5211-gr-a_screw-in_motion_sensor_light_control.pdfIn PDF document text
    • http://ludutuzabaru.iblogger.org/bastien_vives_gratuit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5fce0e8aa0eed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477626/normal_5fcedad310475.pdfIn PDF document text
    • http://vomamafawib.scienceontheweb.net/22175199713.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bifovigavij.myartsonline.com/tejerawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e49527-86ab-4298-9abd-f97d586ee9f7/iso_9001_tahun_2015_bahasa_indonesia.pdfIn PDF document text
    • http://rapuzivawa.epizy.com/tejaxotis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86301ca9-f143-409f-8646-893f1983ee29/wolf_oven_cleaning_manual.pdfIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_c118e7d2b6d94cafa4d53954abedcc50.pdf?index=trueIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_10bca075d2bc437c991d173b3c5265a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43744ebf-fa4b-419b-8cda-aeb079f1a7f9/63003827611.pdfIn PDF document text
    • http://fawexoja.rf.gd/football_manager_2016_best_buys.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c42324e7-c71f-4926-b538-4c3132673855/91007030360.pdfIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_a1b5179029fd44b684051af724f90812.pdf?index=trueIn PDF document text
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_d15fc9dc7bc2478383e28cfb267b7db4.pdf?index=trueIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_af70a1e9db0c4ce8971843301e57f121.pdf?index=trueIn PDF document text
    • http://pezamax.myartsonline.com/nugegisodomajos.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_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 5396 bytes
SHA-256: 28e83d28772529627f953e79847e407e18688b2b515ff4096870c36c0718975d
font_01_sfnt_off0000ff44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF44 10764 bytes
SHA-256: 7f878c14b74ab4e64c6d8a6f90ae2ee41730c2f269b3766fee4516ea0c3d2e2d

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