Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2141eb8dd004110…

MALICIOUS

PDF

72.6 KB Created: 2021-09-21 07:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 45dfb2bf2cbed1d7b438dfad3a614c41 SHA-1: f0318e20bc9b700be4dfe1c06182ec3bbb3086a2 SHA-256: b2141eb8dd00411047b3f108b1eb82b90ffeba2d1317e0be9b4a10b178e23650
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, suggesting it functions as a link farm. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics confirm its malicious nature, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. The embedded URLs and the nature of the document indicate a phishing or malware distribution attempt, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6491

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://haidangpc.com/contents/files/22200310199.pdf In PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f382ec8a34---34926514045.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/53668212808.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/11143244971.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/katasijasamalapekumutipo.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/18305122509.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/75219430273.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/40775066475.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/pogawunesugotu.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/merawajiroxafokokifugak.pdfIn PDF document text
    • http://biomehl.com/images/content/files/kazesozotugivobokaxujajos.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/60710988890.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/99924570108.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/24973279876.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/66287278765.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/wirowafokefun.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/5be9b3a764c4f5516303947525ce51a0/4844838142.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/4649234900.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/xabewanuxi.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/rejugeguwoxotubejivopiv.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/53034184584.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/5104926290.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/xomaka.pdfIn PDF document text
    • https://efnnma.org/files/file/dukijiwev.pdfIn PDF document text
    • http://parilka.by/var/upload/file/vijoxolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=hack+version+of+green+farm+3PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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