Malicious PDF — malware analysis report

Static analysis result for SHA-256 426d3d9ab1ee869b…

MALICIOUS

PDF

72.4 KB Created: 2021-01-14 21:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7c401b05428b58c930ca7c1d32f46f51 SHA-1: ed361c1d52e9a5e739a69ffbcc1e0b40d1a8a31f SHA-256: 426d3d9ab1ee869bb9bc92a7fb41c7a9655f09ddfa744f8edbb8ebbc41e73808
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically `https://cctraff.ru/123?utm_term=grillsmith+30+quart+turkey+fryer+manual+pdf`. The document body, though heavily obfuscated, appears to be a lure related to a turkey fryer manual. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=grillsmith+30+quart+turkey+fryer+manual+pdf In PDF document text
    • https://site-1172602.mozfiles.com/files/1172602/flo_ev_charging_network.pdfIn PDF document text
    • https://site-1175421.mozfiles.com/files/1175421/disney_movie_quotes_quiz_printable.pdfIn PDF document text
    • https://site-1246355.mozfiles.com/files/1246355/55006419061.pdfIn PDF document text
    • https://site-1174866.mozfiles.com/files/1174866/redline_drag_racing_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_5fa95aeaadc8b.pdfIn PDF document text
    • https://cdn.sqhk.co/wovegase/UgPSc2w/botabikoloveko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f89aa0ed3cbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408711/normal_5fe3c8fd2938b.pdfIn PDF document text
    • https://bogujodoj.weebly.com/uploads/1/3/4/8/134881838/dajuvo.pdfIn PDF document text
    • https://bebopajuze.weebly.com/uploads/1/3/5/3/135312866/taxerekimu.pdfIn PDF document text
    • https://site-1177705.mozfiles.com/files/1177705/51418146241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5fada8bb20ca0.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/mujevubutukoxu/72108194413.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/organizational_innovation_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/free_jeopardy_game_template_powerpoint.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_off0000dc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC05 5912 bytes
SHA-256: be5af31617ccca2be953ca4e9489a79c22599d1670d0c59db6495a746cec936d
font_01_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 10596 bytes
SHA-256: 64c30012fc97d6039fa2acb0b4efe7852b9a3c5181f252e7b1d1edc6ef33698b