Malicious PDF — malware analysis report

Static analysis result for SHA-256 05427c62cf438cfa…

MALICIOUS

PDF

68.0 KB Created: 2020-12-17 23:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4e1529152b22aa81a7e6bd98a71bd718 SHA-1: 925eed78e15b8cacd5e3f735cde15a55e3d94690 SHA-256: 05427c62cf438cfa51328036e5e3cd4b5ccae0bf056e856488b92a7b879959b6
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating redirection to known malicious infrastructure. The ClamAV detection and ML classifier further support its malicious nature. The document body, though heavily obfuscated, appears to contain keywords related to the embedded links, suggesting a phishing or scam attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://cctraff.ru/123?utm_term=uilleann+pipes+for+sale+canada In PDF document text
    • https://kosodakugup.weebly.com/uploads/1/3/4/6/134655388/ditedaxufeket.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/672418.pdfIn PDF document text
    • https://patinijogu.weebly.com/uploads/1/3/4/8/134854147/4811844.pdfIn PDF document text
    • https://fimozovaxevaba.weebly.com/uploads/1/3/4/3/134366914/8510576.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/8cff93d3-a0c9-4bbb-979e-5d2bec1a1ebb/tuvexetiwabipapal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d422b0-cdeb-4918-94ab-b3343ffda6a8/22844648042.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce8eac813c4d59a83af3e8/t/5fd625a5154d727871e3e037/1607869862608/zilis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa0859bf-70d4-4ba7-839b-aa890c6632b4/toriwudedopevaxoniw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5156917e7202640050e05/t/5fc639959d79364840610381/1606826389904/castle_crashers_remastered_ps4_discount_code.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51e61affbf90a6605cce4/t/5fcdd7b233187724c41347cf/1607325619330/zombie_defense_guns.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc141b28ef7301f8b131a8a/t/5fc995c7fedaa13a485bba82/1607046604674/city_jumper_new_york.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4f6feaf37e3b649256ad/1606373232655/formula_for_average_velocity_and_acceleration.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_off0000caf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF0 5140 bytes
SHA-256: 1bc4bf63d8bba66e064731dbf7e69f131acda1e29a9482bca76565be22501681
font_01_sfnt_off0000dc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC80 11256 bytes
SHA-256: 76c29e572478a02734739291b5692e7862b052cd8e9797711a9bcaeb9f6d75ce

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