Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3bc71d02d615a7…

MALICIOUS

PDF

66.5 KB Created: 2021-10-03 23:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ad5cd3d6c13a2ee5ec993d87b90631d8 SHA-1: d14f1850f5b26de262c9095684dda5b827b93531 SHA-256: 4a3bc71d02d615a7157a6452cd1d64207190d7928094c08c951f7142e0a9870e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as a phishing trojan by ClamAV. It contains numerous embedded URLs, many of which point to disposable domains, and is classified as a link farm. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware delivery. No scripts were extracted, but the overall structure and URL distribution indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3768

Heuristics 4

  • 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 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
  • 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://eyetracking.pl/userfiles/file/likaritemomopabudelofizik.pdf In PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/zajokefukafedafaved.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/jodemikipajivad.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/81812216279.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/66117564638.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/49901945638.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109301907123299.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/53196918415.pdfIn PDF document text
    • https://qnzar.com/files/85844999735.pdfIn PDF document text
    • https://baptistfriends.org/media/bapexewovezigukeworatoj.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/memodoporu.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/37619377678.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/0d708358b870c7df7130deefef143379/81711441419.pdfIn PDF document text
    • http://e-photosynthesis.org/userfiles/file/41151092205.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/13902825961.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/darof.pdfIn PDF document text
    • http://recviem.ru/img/upload/zademoma.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/47575120984.pdfIn PDF document text
    • http://odumakus.com/uploads/files/gafijoxufazage.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/7942096496.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/vuzukujuginulopuli.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/guworetiviwuzaxaw.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/bab8f543af0188c13bf5123a33bc89d9/wanabinebekoresosusut.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/9690451402.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/zozamoroven.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/jifafila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+add+cutepdf+to+printer+listPDF link annotation
    • 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_off0000b433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB433 10792 bytes
SHA-256: ad4051dd6b1cd358e8684e8f3b2b760782360f085e7a2f6c440f07412c6ea25a
font_01_sfnt_off0000cd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2C 15252 bytes
SHA-256: 2e5fcf781ba48a73c3fffc1709e53d9caaca4ece3ab74eef8a43ec9ed9ae4e35
font_02_sfnt_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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