Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1f689faff46109…

MALICIOUS

PDF

77.7 KB Created: 2020-11-24 01:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b9ee2bf17c5b890314c62ae0789c17c8 SHA-1: 59744989389ccedaa92b1b43607b115be7837437 SHA-256: 3f1f689faff46109fb67fdef2ac83f697a239765a59261c43c950cca92987887
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL points to a suspicious domain, and the document body, though heavily obfuscated, contains keywords like 'plague inc nano virus brutal' which are commonly used in phishing lures. The presence of an external URI suggests the document is designed to redirect the user to a malicious website.

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
  • 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://trafffe.ru/strik?utm_term=plague+inc+nano+virus+brutal PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5f876355e0d1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_5fa215ec59799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_5fab38d19cdd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388841/normal_5faf0ef380774.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://s3.amazonaws.com/minegikukovel/wejogapusaw.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/cato_hunger_games_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f695ec-122e-432a-9867-729f8e20a66e/52493071258.pdfIn PDF document text
    • https://s3.amazonaws.com/medadele/recuva_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/html_basic_template_with_css.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e035848-841b-490f-b2ac-d3620d80b71b/jurevil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a5cfdc2-4e4c-4721-b844-a810bb82a6d3/96123371725.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_off0000e3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F6 5048 bytes
SHA-256: a1a72c61f89593df1f1e7c4b918682c26659689f87bf9cac351c031306c8dbe8
font_01_sfnt_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 11436 bytes
SHA-256: 87912034200d7dc3195276e6ddb89b6b333eaff2595e7243163fc9c652e3f0c8
font_02_sfnt_off00011c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361