Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c791851bb3ebb9e…

MALICIOUS

PDF

61.9 KB Created: 2020-12-02 05:21:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 77d68ba5e3c51d3d53fb6e3b7fbc61c7 SHA-1: 915e6522011ed846f51fbb0bf4e2f607d7744ebc SHA-256: 0c791851bb3ebb9e0e7decb6849b9e46e61eb04d1367250bda092f851bb407a9
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a critical heuristic firing for a PDF redirector link pointing to 'https://cctraff.ru/strik?utm_term=3+g%2527s+restaurant', suggesting it's part of a phishing or scam campaign. The document also exhibits characteristics of a PDF link farm, with numerous embedded links, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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/strik?utm_term=3+g%2527s+restaurant In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416923/normal_5fa09fe9473f9.pdfIn PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/91ef8c0f535.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/bba6bd6d-2da5-4020-a681-af4738783105/four_signs_of_chemical_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3938b333-7529-4815-90ad-9b5c0dbfc717/4976930336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd50ae0-9ef9-48e3-81e9-5ea6ff2c59ac/robuzojopofujajapapubine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e69d06c3-84a6-42a5-93f9-3320380e5f98/5072323363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad7a600-4f8c-4f5e-bd71-2c97c1328f6f/gagugagavuw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd098c00f7af3919d531a2/1606224269288/the_haunted_space_suit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb629e7-ca99-4805-85ab-ba9612f89908/deroriw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab57616-2a5b-4fe5-801c-4a8e63e33f5b/fortnite_invisible_character_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c095e8c7-c780-4abc-9243-576608cb0c6e/nfl_la_rams_2020_schedule.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_off0000ae71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE71 2968 bytes
SHA-256: 1c91280eb79ffdc858b6ecd2b9b1b9121e398c569f5702dd47e27479ee3b0056
font_01_sfnt_off0000b917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB917 4924 bytes
SHA-256: 19a5314c50da06e827fda4fadab8360c2c89807d14cc52068cb0665a4e9c6193
font_02_sfnt_off0000c9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E7 9664 bytes
SHA-256: 228f7be257460fefc9397b9bc7188eaca44a41fce767feb960c09556cad501b8

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