Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d57d79876f02b65…

MALICIOUS

PDF

71.8 KB Created: 2020-11-25 01:48:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ce432739854fa44542b938ce376c12f9 SHA-1: 85b4dbb60709cc610ab7095dc0ed4f22761a1f3b SHA-256: 9d57d79876f02b6500496f7106284b9b5187d0c5f3126cd4301fcb1d8541d4b5
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, which is a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although the document body is heavily obfuscated, the presence of a malicious URL suggests the intent is to redirect the user to a compromised site, likely for credential harvesting or further malware 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://traffine.ru/123?utm_term=roku+error+code+009 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445340/normal_5f9caa3aec9e6.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/ca55e2a4-0d56-4935-b75e-cd7a26cb3405/exculpatory_language_consent_form.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/regions_of_utah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b901f1ce-77e4-4eac-acaa-a4b4abf6b35b/fight_club_summary_short.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e968e6fc-ca22-4e7d-9ee0-f3f3658c340d/dokekilalabepobofiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0307e40e-a117-4e03-b581-8356319e6ddf/john_adams_slogan_for_campaign.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df37bbd9-ff24-4cb5-b7fe-06c75229e75c/wpf_4.5_unleashed_github.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de990330-a89e-4feb-8584-f3eb213e8280/medifoxera.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/ataxia_cerebelosa.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/zatepivuditetematunu.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/cast_of_little_mermaid_live_action_movie_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e75d88-436c-4643-a6f5-79be55dd2bbb/vuvewuwenovaladom.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/varogiwugafeguxem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83bfd660-ab18-4c09-9ce3-e91c7d9e204d/93670538335.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_off0000dc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9C 4884 bytes
SHA-256: e5631262ad51635b38b1bbc9ec1548c10d8ed527191e2afc7dd010b796c6130b
font_01_sfnt_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 10824 bytes
SHA-256: 3540b92103e96c78a2cf818804d68dd3933fc696384070e7e05b1adc1014fc0f

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