Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7745664ed9349dc…

MALICIOUS

PDF

70.8 KB Created: 2021-01-19 20:31:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ab4a528c80747e1c28699e9b14fe27e3 SHA-1: ce242f7448d8c2c807b6ffecfecb69af7298d22a SHA-256: b7745664ed9349dc1c31d4ef353cbc276b6ee7ad5d7ab3351aa380402ddaf919
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://maypoin.ru/123?utm_term=carlos+manuel+el+zafiro+biografia+wikipedia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379612/normal_5fb2595242174.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/iV9KUhh/juegos_retrocompatibles_ps4_lista.pdfIn PDF document text
    • https://site-1257543.mozfiles.com/files/1257543/62622062317.pdfIn PDF document text
    • https://site-1219602.mozfiles.com/files/1219602/pasizatowezemokat.pdfIn PDF document text
    • https://site-1255775.mozfiles.com/files/1255775/fish_screensaver_for_pc_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/fJDjbib/sopojaji.pdfIn PDF document text
    • https://bizavewes.weebly.com/uploads/1/3/5/3/135323934/gumamiferux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5fa8673252a1d.pdfIn PDF document text
    • https://cdn.sqhk.co/vonezositixi/gjhicUs/xifim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500430/normal_5ffc570290268.pdfIn PDF document text
    • https://site-1174180.mozfiles.com/files/1174180/pixuraledirozezepilu.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/hamjiV2/the_sims_mobile_hack_apk_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/iFge0NZ/business_process_analysis_report_example.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/zumomasugipeno/punctuation_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/parineeta_bengali_movie_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/kifaxumotezizogekudade.pdfIn PDF document text
    • https://s3.amazonaws.com/lopazura/minecraft_in_school_download_free.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_off0000d511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD511 5612 bytes
SHA-256: b0637502464be5cc25ea5635659466341b4aa298e37f3a6bbd286c8562526d0d
font_01_sfnt_off0000e828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 11728 bytes
SHA-256: 4dafc591c75d18c00737367b896d4ac87ba9c21f78ae49bbc718e16139f88fa6