Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f41b5eebfea985c…

MALICIOUS

PDF

63.3 KB Created: 2020-12-23 13:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 7f705626a1112c0e6e078f3e0fefb6a7 SHA-1: 7816ca655df19a0a05b43710754af7543e009fab SHA-256: 6f41b5eebfea985c5c62d59c8f4e1b45efc4c15028f244a8ea1f49f0c042de53
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically pointing to 'https://cctraff.ru/strik?utm_term=clone+space+64bit+support+lite'. The ML classifier also flagged this PDF with a high probability of being malicious. The document body, though heavily obfuscated, appears to contain text related to software, suggesting a lure for users to click the malicious link.

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/strik?utm_term=clone+space+64bit+support+lite In PDF document text
    • https://static.s123-cdn-static.com/uploads/4455180/normal_5fe0a7af341c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470678/normal_5fa9122cb0606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_5f980b42c71d9.pdfIn PDF document text
    • https://nibevomixosu.weebly.com/uploads/1/3/4/1/134108547/9984692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446147/normal_5fbc9e1c30bb3.pdfIn PDF document text
    • https://diwetisaxuj.weebly.com/uploads/1/3/4/8/134875536/7787970.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469358/normal_5fc8d46611b33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470401/normal_5fc4a63042b39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443342/normal_5fa14c8da4218.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384167/normal_5fe122e80aa83.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/bejeseja/retrica_aristteles_livro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaea9d4e-cdaf-4234-9826-eb31ea310ae6/febufixatenizikoruvaneno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6eaeee9-bb80-414b-bfb1-a060d95d8eae/fofifajanolavegekeboj.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/csgo_clicker_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/buddenbrooks_lektreschlssel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ce89ea-aae8-40df-8366-978061c6eec9/99178128130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd155fb6-1f9e-4b9e-92ff-70d4143e59c0/vojagorilibob.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_off0000b3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CB 5216 bytes
SHA-256: 592ac29efc8a77c89d7bb232eced740fdb6123bd49b93c858ad67cceb5eecada
font_01_sfnt_off0000c58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58E 13540 bytes
SHA-256: 95ee7727ee962b713dbe816bd2e100e19f594012b51e46d8229c99e4673e7f2c

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