Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c53cb71659812e8…

MALICIOUS

PDF

75.3 KB Created: 2020-11-22 18:49:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4cdbc19a4b5ed298a894bfb9235a26cd SHA-1: c67f5892d729cbd46c12ffae3199e4c2924236c1 SHA-256: 7c53cb71659812e8e2f2bebb6ede0929bdd46c8f2d7a4424cd48ac22009e3a28
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 embedded URL is disguised as a study guide answer key, indicating a social engineering lure. While no scripts were explicitly extracted, the PDF structure and the malicious link strongly suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://cctraff.ru/123?utm_term=ap+human+geography+unit+1+study+guide+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4454558/normal_5fa2d9acb76a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378606/normal_5f94b528959f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370066/normal_5f96a0a112d51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371497/normal_5f8851ed36cbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384469/normal_5f8f773f7d08c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378613/normal_5f8dbbd58e60b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_5f8c109acd4ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381962/normal_5fb3009fc731b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380393/normal_5f8c73911fe88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/tetanus_cdc_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/zakobuxowebitojufa.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/zimenavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70656114-0968-4f48-bcde-da355532318e/free_nutrition_worksheets_for_middle_school.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC167 5576 bytes
SHA-256: daae18bfdeb355b8bf0fac31767ade600a918a7067207565906e0dd2954971d2
font_01_sfnt_off0000d444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 2044 bytes
SHA-256: 00e9c67b84577ee292276cd5de885299f23f5730b2327ee67451e1a4c0ce668f
font_02_sfnt_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 10884 bytes
SHA-256: c47e70a1ec661faf213599281cd402e144a131f041ecf08db1a4b9db56fd2666
font_03_sfnt_off000102ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EF 16120 bytes
SHA-256: e54ae456036517e6b7633f0b0ec9182cc541cdcfda9c6b0bfb569406cd040089
font_04_sfnt_off000117ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CA 1736 bytes
SHA-256: 1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19

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