Malicious PDF — malware analysis report

Static analysis result for SHA-256 3948851c431d27e1…

MALICIOUS

PDF

71.2 KB Created: 2021-04-04 12:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 87ba2ed73d2378ec22c4ce97be0e23ea SHA-1: d19a759a7e6baa0d04b0b6f37d6871b6455cbcab SHA-256: 3948851c431d27e14c1d9e7ecdc97dae049477d715ed6702dcdd97b247d20ccd
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector pointing to 'https://dafemum.ru/award?keyword=australian+food+recipes+pdf'. The document body, though heavily obfuscated, suggests a lure related to 'Australian food recipes pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://dafemum.ru/award?keyword=australian+food+recipes+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403283/normal_6061202daa684.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/all_of_me_piano_sheet_easy.pdfIn PDF document text
    • http://sirunome.mypressonline.com/roland_v_piano_grand_cost.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460972/normal_603521b031b87.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/nstzRhg/46708126321.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/Jwjd39s/jegesigomuki.pdfIn PDF document text
    • https://cdn.sqhk.co/gukituzaju/Hichbhe/thor_ragnarok_soundtrack_its_my_birthday.pdfIn PDF document text
    • http://lozolupamo.mypressonline.com/jexegimexukoz.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/jiG9hij/81467735216.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/jjAAugd/redorafojufubabarode.pdfIn PDF document text
    • http://wusokamojifel.scienceontheweb.net/advanced_google_search_techniques.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491152/normal_601ffcdd0a915.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/04efb281-55b8-4cf5-bcea-b23fa5053a37/el_mundo_mgico_de_terabithia_pelcula_completa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6089fc5b-2856-4a35-88ea-07c3d52e22b9/91935758903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a09f08-f7c8-4549-b5e2-bbd346bf01ed/aircraft_maintenance_engineer_avionics_job_description.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_off0000da50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 5140 bytes
SHA-256: adc0d85a43eb431b4f5c973846d54ddcc09dc55c368b3745b72ba613d4a4ec1c
font_01_sfnt_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 10728 bytes
SHA-256: fc57a427a0b19e49835842f7c323f88594f772360368bc05a2c2002b073f69a1

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