Malicious PDF — malware analysis report

Static analysis result for SHA-256 def7eab64666984c…

MALICIOUS

PDF

87.1 KB Created: 2021-09-18 16:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 94d91bf8b8c668c01ccbd2df6b304fa7 SHA-1: 25e77aafd2e119127972bf7e3ffb6d0c8073a1fe SHA-256: def7eab64666984cdefeb908ebbdd8cfd424a2edbbd5540d187e4fa1d2f1eb2e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many of which are hosted on suspicious domains and are likely part of a phishing or malware distribution scheme. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to download an archive, which is often used to bypass gateway security. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://karate-talence.com/newsite/userfiles/files/59971695175.pdf In PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/putaro.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/39284243685.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/noripu.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/50490445469.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/muvafisejevidemenokijipi.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/dumeliromoxinexazop.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/19676904632.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/19686237426.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/95386898612.pdfIn PDF document text
    • http://sartor.ru/upload/files/pebagol.pdfIn PDF document text
    • http://djapm.com/userfiles/file/39550600390.pdfIn PDF document text
    • https://blogsma.com/files/22711213090.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/85310035933.pdfIn PDF document text
    • https://atlantidegattico.it/file/runawafotidegovogowa.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/61099666075.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/gazar.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140426fc2b88---zakodubaxenexunuxodusajer.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/5777387461.pdfIn PDF document text
    • https://rosycaffe.com/file/34259682376.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/terisifipetota.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/15140904333.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/tufirakimapan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+studio+java_home+macPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 18160 bytes
SHA-256: e5620c60d8fb3408bc57c2fe114049ca8b0e37d8cef0dea9d3b49140c5772693
font_01_sfnt_off00011d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A9 10896 bytes
SHA-256: 34864f6e3e11c2ecc22878f40afded9ce908bc61deb5e5c3cb3547e96fa648d1

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