Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0d3cd575428888…

MALICIOUS

PDF

78.6 KB Created: 2020-12-25 13:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 264b7172b5abe637a705567da119aa1a SHA-1: cf61501f540a5b1f18858c786256350cd745e34a SHA-256: ff0d3cd575428888bcaa4fa3520b250182ef144bcc92a6f3f8ce9666531e92c3
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The 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 'trafffe.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to reference product reviews, suggesting a lure to entice 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
  • 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/123?utm_term=zyrexin+reviews+2018 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376105/normal_5fcca83fd4c45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5f8856b174692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383450/normal_5f9ac3890d5c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_5f8bc9769c18f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375891/normal_5fdd9a2add059.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392650/normal_5fc62932c4187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462678/normal_5faa7cc843847.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/kavitokolezub/30546174360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d658fb60-f222-41d4-bfe8-3565b42d32af/5-_3_defense.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78c2ce9b-7722-4d46-8c9b-1b77d013452b/16096049801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ad2698f-2ad9-488e-8c48-84ee23b3db58/77775795713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7456829e-5436-4de7-be44-b43a868e455d/alabama_sentencing_guidelines_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94424b9c-b95d-4504-9902-6ebf54bdd660/kekezazibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54fa791e-2ff6-4987-89ed-e5b9fac9caf3/shusaku_endo_silence.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_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 5236 bytes
SHA-256: 9192424e67324d25ddac3a6895a481be433cc2ae63fed987f3b345f61ac24b6b
font_01_sfnt_off0001073a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073A 11300 bytes
SHA-256: e6375974a60f046c5115b25e326646580414c68e495bfece0734cd66e5e7c445

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