Malicious PDF — malware analysis report

Static analysis result for SHA-256 88efe84ad1f18c0a…

MALICIOUS

PDF

79.0 KB Created: 2021-01-15 11:18:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d831612db046049765bf4ac553e1be0d SHA-1: e63da544eb6a6d86db18296717c5e66830d45247 SHA-256: 88efe84ad1f18c0a8fe45b3edf3989fb2fcd81796ac7fd915cc13f4a95df8a40
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. It contains an embedded URL pointing to 'trafffi.ru', which is likely used to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, appears to contain text related to medical conditions, suggesting a lure to entice users to click the malicious link.

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=celiac+disease+and+vulvodynia PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485005/normal_5fc93fb78a085.pdfIn PDF document text
    • https://site-1176664.mozfiles.com/files/1176664/gebusikumegawi.pdfIn PDF document text
    • https://cdn.sqhk.co/sivefuxonix/Wp3ifjj/flipper_movie_theater_in_hollywood_fl.pdfIn PDF document text
    • https://site-1166687.mozfiles.com/files/1166687/puwivuke.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/jbijphg/keworomeliraxar.pdfIn PDF document text
    • https://site-1168325.mozfiles.com/files/1168325/53273156291.pdfIn PDF document text
    • https://site-1175166.mozfiles.com/files/1175166/compound_inequalities_worksheet_answer_key.pdfIn PDF document text
    • https://site-1175027.mozfiles.com/files/1175027/85543853112.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/difigomisosak/cb_background_hd_png.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/alcohol_and_metformin_for_pcos.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/political_world_map_black_and_white.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/16742886278.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/aspergilloma_treatment_guidelines.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_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 4904 bytes
SHA-256: 3c9a3ecb0d18e792d75a26b8f5dcf7777191f279fb2a3a9f05489e372f84a5d1
font_01_sfnt_off00010775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10775 11724 bytes
SHA-256: bba0d9b1d58a0b39f419b6458dc61020cca33e2e2e8fb5647260145792ac0f53