Malicious PDF — malware analysis report

Static analysis result for SHA-256 067de0c0588d25cc…

MALICIOUS

PDF

80.4 KB Created: 2020-12-17 15:57:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2b73e8c3e3ba4d29373b466703c9b129 SHA-1: 5d1905a478338e7d0547cef1839cf5fa5c700b6e SHA-256: 067de0c0588d25ccfaba1fe5709b3fc3d5155265f4680cf1968d6084ed763c21
96 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, with a critical heuristic firing for ClamAV detection. An external URI pointing to 'trafffe.ru' was extracted, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically. No scripts were extracted, but the PDF structure itself likely contains embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/aws?utm_term=best+chinese+handwriting+keyboard+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5faa5b0f3e4af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5f8a64c1aa1c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475872/normal_5fb5b6d4094f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405186/normal_5f9d77fb4098c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451023/normal_5faf7f1d4bd63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414495/normal_5f9a3340d973b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447662/normal_5fc9316a82d91.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://s3.amazonaws.com/toliwudalamem/msbte_model_answer_paper_17515_summer_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9c00ef0-30f1-458e-9de7-bd137f42e605/22902162795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ace33e-1b3d-494a-b3f1-67798ecf73ed/29003794141.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/tibevokudovojuxifisofum.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/manibagofitiwutuze.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/vintage_valley_pool_table_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/82851640667.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 7252 bytes
SHA-256: 6106e05386aedf7c33449d2025c573b8be1bdc56869570f35a290d9bc7d879c5
font_01_sfnt_off0000effa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 5404 bytes
SHA-256: b2f44ca2ff48b1b8a8a351920632485ee03644c2b22cba257b84e3ce13e1febf
font_02_sfnt_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 10648 bytes
SHA-256: 921e798cc8cfc16744b588406991ea00f4c356492fd4cf49f0f20697b678bcef
font_03_sfnt_off00012620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12620 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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