Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd06c363f66153a9…

MALICIOUS

PDF

78.1 KB Created: 2021-09-10 03:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0a3ba7f25e8393a3ae86174f8e5e93f5 SHA-1: 7e98620658bad948d63d3fcf0447a767e1251a5c SHA-256: dd06c363f66153a925b22798aec55c305a564c46068cc58c18cca030f8bea8bc
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and UTM parameters, common in phishing campaigns to obscure the true destination. While no scripts were explicitly extracted, the nature of the embedded links suggests a potential for further malicious content delivery or redirection.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4580

Heuristics 4

  • 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 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 http://patp1ryb.ru/media/file/75878282907.pdf In PDF document text
    • http://raegcafe.com/uploads/files/35987879063.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ce4cc4ca22d0c1def18e1d74fb9b261a/54981080465.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/potosuxevukunipewesuxosot.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/20254484169.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/73958779994.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/52425198761.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109090816378512.pdfIn PDF document text
    • http://otczenacts.com/media/files/wexigelotet.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/bewazijuwokafugoz.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/41586514856.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/71156464900.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/mogewilu.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/bojiwizavijeb.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210903045016.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/keneli.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/samewegovosaxedulomujitod.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/sobisawegukudubumozu.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/4297203482.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/79044089712.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/galitegoketarufesasirotaf.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a071d968a01357dc2d496dd5d47dee86/70962180584.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/86149585608.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/xonawubezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=adblock+chrome+pc+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 10720 bytes
SHA-256: f73ade89e766cd14146c5beb9b1835e5603065fd5906f40ad9a2151feb95c90b