Malicious PDF — malware analysis report

Static analysis result for SHA-256 551791764a7e122e…

MALICIOUS

PDF

67.7 KB Created: 2020-12-24 11:50:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9672cd06ddd98d479ad226634e73acce SHA-1: bd664ccdd960174cb3c23aca91bf315a00e3b1b7 SHA-256: 551791764a7e122e9f71ed7556c5fb50fdaa51fb66d30eb0d63738fb515c5057
96 Risk Score

Malware Insights

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

The file is a PDF with a high ML classification and ClamAV detection as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, trafffi.ru, which is likely used to host a malicious payload or redirect to a phishing page. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the malicious URL and the detection signatures strongly indicate a phishing or malware distribution attempt.

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://trafffi.ru/123?utm_term=sarah+stickney+ellis+the+daughters+of+england PDF link annotation
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/fd5f85505.pdfIn PDF document text
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/levedetozulaviber.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377128/normal_5fa405251d2cc.pdfIn PDF document text
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/9085714.pdfIn PDF document text
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/rogazov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368496/normal_5f8d651cbb48e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_5f91052419f6c.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/xojafemori/nojebopijalu.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/gdevelop_free_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ecc93be-8d37-43ba-9eb8-77eb7da830c2/naruto_movie_2_bonds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc5e21e5-2921-4dda-9a1c-ae637a03271e/96734465752.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_off0000c941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC941 5552 bytes
SHA-256: 54b4ef73feda6b0d88bf92377396b5072f0974f1dec58f4896e55dffa771a64a
font_01_sfnt_off0000dc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC29 11164 bytes
SHA-256: fb74923118e9b71709c724f9ee1c309f40bc713d4e065b4e2d86fff3e95e20da