Malicious PDF — malware analysis report

Static analysis result for SHA-256 26aafb688a9e73a3…

MALICIOUS

PDF

81.2 KB Created: 2020-11-25 18:45:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 96d483f8a096f2722338f1633456fc9d SHA-1: 912012258bb00e95fcd095da9a6b8fe73bdf64d1 SHA-256: 26aafb688a9e73a34adb36080632159a404e495503ff791f2678d57ed534e050
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. An embedded URI points to a suspicious domain, traffset.ru, which is likely used to host a phishing page or distribute further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often abused for creating malicious PDFs.

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
  • 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://traffset.ru/strik?utm_term=dark+roots+blonde+hair+ombre PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391303/normal_5fa1bb01dcfd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e134f65a-fcc5-414a-903f-1f92fb329fe5/better_call_saul_s01e07.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/60742233762.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/9232398939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ec9924-68c2-4a11-a7da-f2a6fea7cc60/fimuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92f9e02f-4fc9-45a6-834a-676d027a21cc/94424334135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/291fd91a-8bf7-4255-a506-bd97b359b88f/1109594711.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/bosanitodogukonenimivepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f6637ce-de53-4e6c-843e-dde39ecd0179/24339429631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34304f10-4ccf-4547-93ec-d2c7c6e003c2/infinite_rare_candies_pokemon_emerald.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42401c96-10f5-47b8-81ef-eff5221977c6/together_for_life_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/670bb2b3-d7f2-4e20-881b-8c8f42c04a13/twas_the_nizzle_before_christmizzle_poem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8001a4b7-ea07-4696-af74-dae7108a8964/bevijepotarutotosifutoles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c815041c-b5b9-44d7-94b2-f58029f3d9f4/formulas_de_partes_por_millon.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/54392255180.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 5056 bytes
SHA-256: ecd7cff96fbd2e1aae9a66d7de79b24688c2df1793091eadcf2b105cb0f768ac
font_01_sfnt_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 10464 bytes
SHA-256: a8314d3cf9abeeb10ddc8e6e2f235f09debed2832a4d97bb8ffc63d18ba2c9b2
font_02_sfnt_off000129c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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