Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c9c61688fd0f69…

MALICIOUS

PDF

70.8 KB Created: 2020-11-25 23:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ab1ad7d13fc0c2e8c7505feb8ade81e5 SHA-1: d983c1f43e887aa2b1447389d597842093c0d5a5 SHA-256: 39c9c61688fd0f699985106ef4708ae178028c9a0ffb82ecb11af013754be236
96 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'traffset.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, contains text related to 'best friend application meme' and the authoring application 'wkhtmltopdf', suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/strik?utm_term=best+friend+application+meme PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5fbc1196d4b32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f87507b8ea59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457881/normal_5fb7363f2f9ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_5f8a1971cb174.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/328e57d8-6bbc-44dc-9c2a-53b42f130347/29962279749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0df52d33-9542-4f59-bfaf-f8887a34f07c/mowutagisanexazusevag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66320f4e-4c0e-4fb0-96e5-94ec1ef1c7f7/49011909125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/124c3edb-ef7d-4099-84a9-0c697887ea27/elsword_blessed_restoration_scroll.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/724b15f4-04ff-40b0-8aad-98058c4bf47e/quick_shooter_metal_detector_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2a523ff-df6d-430f-85a3-fda5ff0d7eea/mexureraredukazetozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72c65242-161c-4acf-9978-16127c1d579d/71774971177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4f9cfbc-7866-4377-951e-86f202ec7e70/custom_weapons_starbound.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_off0000d8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F8 5348 bytes
SHA-256: b5df9798b941e161cc2e79e0b7eee4a36c78fc6aa9a693e5290b0a486203a68a
font_01_sfnt_off0000eb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 10440 bytes
SHA-256: d36c61024687c671f27d7a0993f5706e9b69c76b161c1d30f141d4d839b554a7

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