Malicious PDF — malware analysis report

Static analysis result for SHA-256 76abc2460cd58b2e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-22 18:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 955b3af8cbe0edb2a7ba63af86876423 SHA-1: be040c142ccad93f717b4dd20f646132ec87fe07 SHA-256: 76abc2460cd58b2e213989dcfd141cecfe44b4a48588ff2386b1884533227f4e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

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://www.amata.org.uk/ckfinder/userfiles/files/6169763094.pdf In PDF document text
    • http://kryotherapie.net/neu/userfiles/file/14224439685.pdfIn PDF document text
    • http://schokofontaene.de/idata/85092693840.pdfIn PDF document text
    • http://prosquash.by/data/28663256014.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/23333273694.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/kenateturejawunelatosavok.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/nexetavaziluteritud.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/52556413148.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/75714519203.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/50608095166.pdfIn PDF document text
    • https://eventaipei.com/upload/files/38779896734.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/gitikerigirisodo.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/301433482.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/75716803953.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/88194344125.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1e89cbcc1---dumiselifeno.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0751aed0---98413315431.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/73786872737.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/92203049499.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210919120632.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/zarurumimizeput.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/lamudejigumavodaxepevaf.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/55684253392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+connect+physical+keyboard+to+android+phonePDF 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_off0000ceda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDA 17484 bytes
SHA-256: f28106142852126519abb36e7295f7f94426b3676336670b4ce9d69ac46951d4
font_01_sfnt_off0000fc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 11036 bytes
SHA-256: 5cf572a1c75419af2211ec7027d35223da3a38ac85ef7200755167b3d74578d3

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