Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f264208298ff13…

MALICIOUS

PDF

84.5 KB Created: 2021-05-29 04:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9da3a7acc4d338bca1840156e4aa4a3d SHA-1: d0b7f2d81e9da49545dcbf67f81942c9acba3679 SHA-256: 43f264208298ff134ac8c85d78ece788960c10df2b2c88f7103de8645f725de5
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URL suggest it's designed to redirect users to malicious infrastructure, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=weather+and+seasons+worksheets+for+grade+1 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_600a74e7e2d3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387925/normal_6043e7622998d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388428/normal_606d00be4e65e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_60255be08b8a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460060/normal_60306a39a40f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421778/normal_5fdf905868ada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473919/normal_6057e0f841828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451750/normal_603086a515ed0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470028/normal_5feb781b3b3c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406454/normal_5ff1c1b5bfcfc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382209/normal_5ffdbe07cfe30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366400/normal_6006eb65d24c8.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/ee900173-c506-438f-ae84-8705ba8f311b/dish_network_phone_number_bill_pay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6dd74e1-2aa8-4c96-a6b5-57d1d3ac8bf8/87457176445.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc68e323-511d-4dbc-a7ac-42adbfdfaf96/39431642790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f6daf1-4829-48b6-a638-5f40d77e970c/vasabitipozen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc997d95-03dc-4572-9f18-584fa772cc3b/how_long_to_charge_my_fitbit_flex_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90976942-6025-44ed-982a-7354a52c45cd/pixel_movie_songs_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c5df84f-6039-4d83-93e6-afab47c772ce/buzuvifaxupenirerupided.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 5360 bytes
SHA-256: 9b77b0c2f26a4015f41e8e0a7917a005d248f1d9182961fe2fefc414259f6b90
font_01_sfnt_off00010702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10702 11524 bytes
SHA-256: a471bb53e54533edc3241c1b43769fde66ea6451aad15eaeb93ae5d82c4c3835
font_02_sfnt_off00012d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6D 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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