Malicious PDF — malware analysis report

Static analysis result for SHA-256 a610f7f1ad3359bc…

MALICIOUS

PDF

66.8 KB Created: 2020-12-04 09:30:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e0425c8869fc3def89b82d30013ae077 SHA-1: ea740cdab653d17f0c742a85f129eac84a6b8ad9 SHA-256: a610f7f1ad3359bcd0c36baf43bb07b8f18dc8803ee206ebc5c4f591f2cb1b8b
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, identified by ClamAV and ML classifiers as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content. The presence of the malicious URL indicates a likely phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/strik?utm_term=issue+170+american+woodworker+%25231702 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393514/normal_5faa620143719.pdfIn PDF document text
    • https://sumudopijo.weebly.com/uploads/1/3/4/7/134716274/8344900.pdfIn PDF document text
    • https://lamosovi.weebly.com/uploads/1/3/4/6/134600354/36c8687045.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/rebesudanolo/business_email_writing_tips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ae6198-4303-47a8-be4a-159787c8e4e0/39729858007.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf045cb3e0f57711398f0/1606283334757/where_is_area_code_423_located_in_the_united_states.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc37bd13dfdd95b60e57127/t/5fc4eec4eaf37e3b6437248d/1606741700257/encinitas_union_school_district_pay_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e808f969-0c9e-4459-88d2-7241025ad2f6/gutadogikaji.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf52b1fa04221c71172004/1606374077188/ley_de_exponentes_y_radicales.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc27aecc14dfd36fefb8ed8/t/5fc3ffcc3485235c864253b4/1606680524380/dr_who_scarf_colors.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/napirovesezafawuxuxarav.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_off0000baf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF6 5220 bytes
SHA-256: 29d77522c6bb8ebd75cebbd4e9012b44c70aa2722b580d4457043faaecdb4361
font_01_sfnt_off0000cca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA8 10520 bytes
SHA-256: 810687a1303ab37b06845467d1bae52a51944586841eca6fd17de13ddf76b55c
font_02_sfnt_off0000f073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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