Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a26299d81977531…

MALICIOUS

PDF

60.9 KB Created: 2021-10-06 10:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2d0052280acdf5a7101ccfa24eaedc03 SHA-1: 2fa1f26f80c68669e301ed83f822010b7cdfba9a SHA-256: 4a26299d81977531f621224bf00b9ce8dcb559ba5f2a2cb246a801edbafbf28d
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous URLs, including one pointing to 'edilgroupdigiovanni.it/userfiles/files/8102283326.pdf', suggest this file is part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7260

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://edilgroupdigiovanni.it/userfiles/files/8102283326.pdf In PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/54874434174.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/jexurerokum.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/60610108158.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/jesejepejedomubiketibixu.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/33218377088.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/29742512098.pdfIn PDF document text
    • http://markone-tools.com/upload/files/pabonupefujupezusefinedi.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/saravinexawivafilaxus.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/fadamoru.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/marogukewofororurema.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-6/20210906034915262108.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/muburelowigemunivabule.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/nawiludot.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/davugejovuvagobu.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/57750716243.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/tirobalokazisa.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/kikobapolozijir.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/81630564874.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/8053245364.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/51666715469.pdfIn PDF document text
    • http://biomedia.asia/upload/ckimage/files/gapebusorokuluzezokatud.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/28646396291.pdfIn PDF document text
    • http://ijiantu.com/filespath/files/20211002213550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=amadodenu+mp3+downloadPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/puvadirusas.pdfIn PDF document text
    • 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_off0000bc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC49 17544 bytes
SHA-256: d156d72a3f50d57df45c60436977bead321897eaf892ed2c64c9148a9e0953ce

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