Malicious PDF — malware analysis report

Static analysis result for SHA-256 774c6c1c14b4e1cb…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 23:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e8d8890b724a2295053a47413b286c5 SHA-1: 46911ea89559193b3330c702a5df3573ab50e676 SHA-256: 774c6c1c14b4e1cb2b900b84c1061da12c1a1bd13f8f9fcac950d985cd282b13
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also exhibits characteristics of a link farm, with a high number of external URIs pointing to various domains, suggesting a phishing or content-hosting lure. The embedded JavaScript is likely responsible for executing malicious actions or redirecting the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://metricgroup.it/uploads/file/37739401810.pdf In PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/lepebuzagunabefukuwokopid.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/76389872954.pdfIn PDF document text
    • http://medi-sen.com/files/files/33566594357.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/96943718793.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f507a2f3ef---walepixomitapuwinoxo.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/xesuse.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/70793425748.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/17159671120.pdfIn PDF document text
    • http://keramann.ru/uploads/files/fuguxojurarimedudam.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/14799725129.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/dasopevixuleja.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/tiboruwejim.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/pisejezogoke.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/pabevumorib.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/1214677970.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/37972e990eab08a1bc69e039d24a7919/derizapipapepugifixosesix.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/rutugoxupo.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/31701102522.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/41549751185.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202191225611874.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/kanaler.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/60997228872.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/tugadijutapozanegivupezek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=offline+tps+games+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 17148 bytes
SHA-256: b683a673a5be48cb75872de2f4ff80f8b08a7c604136a7f032b0e1efd4527dd2
font_01_sfnt_off0001078d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078D 10864 bytes
SHA-256: 72f6c45dfb882d9fac793813650e9fbfbba78ddfc593fc9c55ad9b8adffbdde0
font_02_sfnt_off00012069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1