Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31ed98c3f955c2e…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 05:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 45b81ba1b889064ac205c931a94a8494 SHA-1: 6cd48bd9ff12de3f523ebe8c39e39b76f64004c2 SHA-256: d31ed98c3f955c2e67414d741f5f762f09802fa6dc50aeac8f0efbe3c7eb3bca
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host numerous links, likely to further malicious sites or phishing pages. The embedded JavaScript likely facilitates the redirection to external URLs found in the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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
  • 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://irlanc.ru/uplcv?utm_term=apk+baca+light+novel+anime PDF link annotation
    • http://aurora-c.jp/files/files/3415464186.pdfIn PDF document text
    • https://norservis.info/files/files/60202241054.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/70577295604.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/tesoliwavukijadilusanupa.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/wozewajibasakesugimalig.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/85156284374.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/rikikinapuwuwufepilopeliv.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/lonumuxujikigegigozom.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/ratajakoveroloxulanu.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/29759874376.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/75465628174.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49392326210.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/19d18bbc58decf69e273256ab0378ac8/zejezobofika.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/vabumamupugilegig.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/rurebesawamugudipewa.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161356ca028a8e---zibukerobewawezubufobeniz.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/46800914507.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/13098079523.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/binagagewamef.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/66840529050.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/5992340407.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/lunebefiledo.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/29246349557.pdfIn PDF document text
    • 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_off0000b401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC13 16828 bytes
SHA-256: fd13916ec7ae0ca6bd5e7388e297f087ed271a0e962fc2d63204423ed942e184
font_02_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 10832 bytes
SHA-256: e587b45cb2c57107460dbde5046ace1b8e46e7ffecaa8db81c219ee45f07bb56