Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67cbd272d5ad985…

MALICIOUS

PDF

73.8 KB Created: 2021-03-20 16:03:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4af90621964679180481fa81991dfd8f SHA-1: 1f63710a85f426924ce6b8f7b204aedbb6ab34a1 SHA-256: d67cbd272d5ad98541e414a9aab37ad2921c48011497e76dc418e2e71b536bb9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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://dugedepap.ru/strik?utm_term=ice+breakers+questions PDF link annotation
    • https://cdn.sqhk.co/bivuwusim/Qjfzij4/sdg_game_board.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446497/normal_5ff1393fc4950.pdfIn PDF document text
    • http://narosisebono.22web.org/11113533452.pdfIn PDF document text
    • https://pegepujime.weebly.com/uploads/1/3/1/4/131453637/putuda.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/Hsiciia/31661170155.pdfIn PDF document text
    • http://pekuxareja.22web.org/30734745500.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/geyzhi6/lexomodire.pdfIn PDF document text
    • https://cdn.sqhk.co/vefasebo/NjghiNI/fonavawuwifof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383680/normal_5fff6c6fc9eea.pdfIn PDF document text
    • http://xugafigipi.22web.org/chipmunks_sinhala_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/a4ghRZB/30541949932.pdfIn PDF document text
    • https://cdn.sqhk.co/lolatonuvesa/agfiLJR/crossword_puzzle_related_to_english_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456998/normal_6029df651d32f.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/ifhbxhh/radiohead_albums_best_to_worst.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/dbd04b8f3696b90.pdfIn PDF document text
    • https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/62ecfce1170e4e.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/QjjjdnM/fasubiwojowogujemonetagit.pdfIn PDF document text
    • http://modalidetefid.iblogger.org/94670920516.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7540807-94ac-4915-a584-3b95dc83bce0/samsung_tv_cablevision_remote_control_code.pdfIn PDF document text
    • http://sanenuxaxegozez.rf.gd/ford_555_backhoe_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b883704c-f0fc-4504-9219-9a84dd7d668c/is_indian_tribal_income_taxable.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_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 5028 bytes
SHA-256: 96d48fcc04f9b4b384bc722f6bf5ccc2b6dc3a1077b0e3e3a563e56c3125a9a0
font_01_sfnt_off0000f661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 10548 bytes
SHA-256: 93cc8c6168c6f722d25ca3883939053dee6c2f160a5a5b56b1403b6823b42fe6