Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a8d93df46397ef…

MALICIOUS

PDF

70.5 KB Created: 2020-12-02 20:18:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f8a8a7705b247f28f124f7284e17fb2c SHA-1: bbcccdf8264f286d13378baa120a842dd1cd8799 SHA-256: e4a8d93df46397ef0a718b867a7a81779383c08354b7f3fc175c9d00cdca9800
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?utm_term=cartoon+guide+to+genetics'. ML classification and ClamAV also flagged this file as malicious. The document body is heavily obfuscated, but the presence of a malicious URL strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=cartoon+guide+to+genetics In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413978/normal_5fbd34110eacb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5f9e79c9466a0.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://static1.squarespace.com/static/5fc0e6b83dfdd95b60d5131d/t/5fc588893570fb44d1bfed45/1606781065834/mejamixonetuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/autism_facts.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc36ab50b6b03258f456e50/t/5fc6c98abfb90028be3c3d12/1606863244392/best_b_class_race_car_forza_horizon_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b07f2e6c-80b0-48e0-98dd-a4b8a8d2d8bf/algoritmos_ejercicios_pseint.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/black_heel_boots_platform.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc316acaffbf90a66f8b931/t/5fc48a324e98326c02a29cb4/1606715954772/gozejiwosidiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb59c1d3-459b-4456-b874-beb261248318/pozowejawarulufusefuvexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ef2627e-50d0-48bb-80e2-3e4a84c5c2e5/sling_television_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf634b3570fb44d1fa9c4a/1606378327869/guviwagubalerul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7180d5af-0599-4e48-b29b-0c6f760abb78/73796581428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a83d25-85f9-41ec-853d-eaa9501551ee/holy_guardian_angels_school_reading.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26b97cb-feda-4856-aa35-49c31fa4225a/6998593624.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_off0000c92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92C 4980 bytes
SHA-256: 03f00d39cbcea51bfe2d1886565eed25bf0888af77387cfeff1b85d2a65c536b
font_01_sfnt_off0000da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 11120 bytes
SHA-256: d95d3ad58c5ffdb0ddaa163acfde9104910b6e3aa1aa775cd21dae5eae1d3bc0
font_02_sfnt_off0000ff13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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