Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e9d13474817ad5…

MALICIOUS

PDF

85.7 KB Created: 2021-09-21 04:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 71c8d17c564b1b3fbbafb5cf750c07ea SHA-1: 3326d454d8a2fb3571d4e5acf49aad66c5a9a2a8 SHA-256: 92e9d13474817ad585b86a205f48cafc50566ffb13ec3f71e70d547ecaec768b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. The PDF also contains numerous external URIs, many of which point to disposable domains and form a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e05afb140aed291da9b830719a84bbfa/99991020919.pdf In PDF document text
    • https://novamakine.com/upload/ckfinder/files/zogadoxoroxedoxifinila.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/14089096589.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/selobaberozuguxulowegata.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/begov.pdfIn PDF document text
    • http://xn--5dbfbdrd7azav1bcx.com/sites/default/files/file/jejitakifulawep.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/15373123821.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/pemikefixoretomad.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/voxezezevujafop.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/guxakewejosam.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/lumorigejakebononubekolut.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/gubafi.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/xobatusajugud.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109140230498192.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/57052584981.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109030329168682.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/28477423858.pdfIn PDF document text
    • https://esz.jp/img/editor/files/88667491619.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/86823188150.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/waresu.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/92087166465.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/kufiwixitat.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161420096983ad---fowoki.pdfIn PDF document text
    • http://wenxuezj.com/images/File/mujigumebelotitunivizoxad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=remove+encryption+from+android+phonePDF 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_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 10896 bytes
SHA-256: 9d30cd5ad54035fdea38119d9a04925e4b4c3d0ac3607bdc9d78880e70cc6eda
font_01_sfnt_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 17620 bytes
SHA-256: 455a8ba3edffe94396e2c3808a036caa1f260d302e29fa8ba65a083f68cb2225
font_02_sfnt_off000130c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1