Malicious PDF — malware analysis report

Static analysis result for SHA-256 da74c8f1aaba07ae…

MALICIOUS

PDF

75.4 KB Created: 2021-01-12 18:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54befe37de2b4fbbbf87d8b6283b38b0 SHA-1: e8b399048709d8b0d6d40e01254577f9a7074dd3 SHA-256: da74c8f1aaba07ae1ae8fd20ae2ffc1479db331f1d623c78b05a2a40042e31df
214 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, masquerading as a leveling guide to entice users. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of these links directs to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/123?utm_term=everquest+leveling+guide+90-100
    • https://static.s123-cdn-static.com/uploads/4368265/normal_5fccc2ca9ec4b.pdf
    • https://static.s123-cdn-static.com/uploads/4446174/normal_5fedf9c45f73c.pdf
    • https://sumesomorap.weebly.com/uploads/1/3/0/7/130738681/fexetoxok_rudema_kikuzavep.pdf
    • https://site-1174602.mozfiles.com/files/1174602/sandwich_near_me_oakland_ca.pdf
    • https://static.s123-cdn-static.com/uploads/4377642/normal_5fcc93119bbfe.pdf
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5fbad2951cec0.pdf
    • https://vefenebef.weebly.com/uploads/1/3/4/8/134885139/nifaziduveli.pdf
    • https://site-1168481.mozfiles.com/files/1168481/best_avatar_games_for_android.pdf
    • https://site-1188059.mozfiles.com/files/1188059/odia_cartoon_video_song_download_mp4.pdf
    • https://static.s123-cdn-static.com/uploads/4418401/normal_5fcf043e9e6b4.pdf
    • https://cdn-cms.f-static.net/uploads/4379483/normal_5faa2d616d41d.pdf
    • https://static.s123-cdn-static.com/uploads/4379359/normal_5fcc673a5eafc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea06.bin
ee5aad9867d07a27419d93f6c209a892155d94b2c7ad2596e05ad95be2a4f7fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 5308 bytes
font_01_sfnt_off0000fc32.bin
8b11ded9d986500ab064e1a07cd97a6d826d3405d19f0e7d4f66721ed8ade89e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC32 10716 bytes