Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e399ec4fb39f46…

MALICIOUS

PDF

90.0 KB Created: 2020-12-20 13:50:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5bca0d3fbc51c18d9db0af80b29571f6 SHA-1: b15fdfb1ceab2833ad253f123606d0fa747d90ad SHA-256: f5e399ec4fb39f4689d58f402319ff2a897c460477f9d3e1215b465a50d720c5
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a 'PDF_SEO_LINK_FARM' indicating a large number of external links. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic suggest a phishing or malicious content delivery attempt. ClamAV also detected this as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=travis+afb+hospital+address PDF link annotation
    • https://sewobefavewekog.weebly.com/uploads/1/3/4/3/134367647/ff127c.pdfIn PDF document text
    • https://xirazaju.weebly.com/uploads/1/3/4/8/134859293/2f65416c4.pdfIn PDF document text
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/luzuvusuri-rizitejakafufe-wuzuvosow.pdfIn PDF document text
    • https://rebeluzibefu.weebly.com/uploads/1/3/4/6/134619862/magepugogegotev.pdfIn PDF document text
    • https://komomofuxuz.weebly.com/uploads/1/3/4/4/134494735/2831872.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/farejekisawor.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/900b0.pdfIn PDF document text
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/9905364.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/vonusirukete/bob_marley_biography_book.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/12079011314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/431b47ee-8556-4877-b870-360c73278108/musket_master_pathfinder.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/biochemistry_report_alt.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/sport365_apk_2019.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc527a3c6229360ecc88336/t/5fc81ae213de6e79814d6b51/1606949607353/launcher_for_mac_os_style.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc06b148139af037642cc0d/t/5fc11011145a8629dcd68422/1606488082744/songs_in_3_4_time_waltz.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/keystone_finish_line_biology_answer.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_off000122f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F2 5280 bytes
SHA-256: c538656d6eb747c4eb52c98e26a290c2f6d13aa7a8b811d670d4cfce387a5c39
font_01_sfnt_off000134da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DA 11364 bytes
SHA-256: b00f9c14e3967c1809a41912f17838834b06c2805f924a8e60ca099cd778f8b5

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