Malicious PDF — malware analysis report

Static analysis result for SHA-256 28691a10658c58f3…

MALICIOUS

PDF

79.2 KB Created: 2021-04-06 01:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 33a2fc8b6d74729b04e234269002ccc9 SHA-1: f2df6b4c9dd831e250d9e6ef93b2412de44d5313 SHA-256: 28691a10658c58f35bf9832e6b1c4350c74c9defa323721f3c30a3a945d871c1
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains an embedded URI pointing to 'zajinet.ru', which is flagged as a payment redirection lure. ClamAV also detected the file as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the nature of the lure and the ML classification suggest a phishing attempt designed to trick users into visiting a malicious URL, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://zajinet.ru/strik?utm_term=will+medicaid+pay+for+couples+counseling PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482636/normal_6032b5360aaf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445743/normal_6025eaa1d9e89.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/jcgcf82/7786852684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448330/normal_5fd967daec3ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472763/normal_5fd7beb62d821.pdfIn PDF document text
    • https://cdn.sqhk.co/fajaleniwa/1t2ziff/chorus_vocal_music_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427274/normal_60162fc51497c.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/Vx0sZhh/bunuxuvol.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvajuvewuj/jfqpGjf/battle_tanks_global_assault_cheats.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wokonudiru.epizy.com/73562466279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c085954-040b-47cd-a9fa-7856abaec09e/the_highwayman_cyberpunk_bug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb813b81-0923-43af-962c-cb19d38d5b36/58392860832.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/91962438690.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf8657c-50e5-477e-abab-38fdca2fc0d0/modutifuferudewis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/111c477c-91f8-4a81-ab4e-b4bb84b72e5d/john_deere_mower_mulching_blades_48.pdfIn PDF document text
    • http://lekegavavab.epizy.com/sony_dream_machine_manual_icf-c1ipmk2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9def39ab-e9e3-49c9-84a6-a6ae59e9b93c/banofovipedixukawi.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/81299348987.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/fundamentals_of_statistics_5th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74124b0-0836-4aa0-a6c9-89ad32ae8496/56156599524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0da8e2ad-9d11-477d-b7b0-eb6e9d11e2c1/pasoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4590361e-e2a9-4a3b-bf87-831bf87d811d/69669644608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7c9ba81-c7f5-4baf-b9e7-43f7caf40a38/puvaja.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_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 5588 bytes
SHA-256: a2966809e3cc4428a56206831f343e4557d744c1c84aa29b2a0e5ae14da4c50c
font_01_sfnt_off000109e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E9 11068 bytes
SHA-256: 4da143dbde6042ef0fe3da614fa895afc005e8d8da23b0684cea0312039ddaf9

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