Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9906833039d50ee…

MALICIOUS

PDF

64.0 KB Created: 2021-09-13 21:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 64b2cd7b76b06927f721a81114a77691 SHA-1: 7bed98dde9baf3da4f38a37c9cda6fcd840a4d14 SHA-256: b9906833039d50ee2cf8b733a50ca618b7c069af356e842e6f34c2f7547e0b30
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. The document contains numerous embedded URLs, many pointing to potentially malicious domains, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

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://gangnampools.com/contents/files/85517327409.pdf In PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109092120523718.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302f6a9272c---rixamadobukalelijisije.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/701163778.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/12546207183.pdfIn PDF document text
    • https://razredna-nastava.net/files/59001120775.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/42132535573.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0ad114f6f4366fc82390caf96a1c8162/timuvuvimizagosusubati.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/19379195819.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/17364296497.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/44051400761380fce93a20.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/33787266253.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/23260338368.pdfIn PDF document text
    • http://kisito.com/userfiles/file/jabavuxanakaketoporigewi.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/diwozulojijoboja.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/ludomimopovakazokijafas.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45607868206.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/birotuditujaxadapiga.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/wizomexigu.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/37442747930.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/51256515977.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/85776793074.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/20457710808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sdkmanager+install+adbPDF 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_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 10780 bytes
SHA-256: f9412797656dd579a1b914608d77ff9796fdafb66bee2e1b27910d3651d3d858

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