Malicious PDF — malware analysis report

Static analysis result for SHA-256 b224712cb5d8c6cd…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 03:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8415bc6b10f190d293faf3e5574232e2 SHA-1: 37de58ed548454067e5d20c66f7a7909a4101f88 SHA-256: b224712cb5d8c6cd1b33156b440f35e96c0f392b3f10efe79be4ebd1fefe3959
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript, which is commonly used to redirect users to malicious websites. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised or malicious domains, suggesting an attempt to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/vepojuronumosod.pdf
    • http://nollve.com/img/editor/image/file/somupaxuwu.pdf
    • https://fainitelecommunication.com/public/editorfiles/file/betusivepet.pdf
    • http://pscworld.eu/ckfinder/userfiles/files/vomikiguramamemajela.pdf
    • http://casms.org/atts/news-files/file/10402366308.pdf
    • https://newchat.xyz/js/ckfinder/userfiles/files/5177689361.pdf
    • https://yesilkoyluleriz.biz/resimler/files/58503118615.pdf
    • http://kiavysocina.cz/UserFiles/File/mijigavuwuwovu.pdf
    • http://www.fuchingrading.com/upload/file/lufopekowonulenofaxovat.pdf
    • http://jlssj.com/qianzi/upfile/case_editor/file/75003428595.pdf
    • https://ilonew.tasksplan.com/userfiles/files/vatukivopeki.pdf
    • https://mlbcsimleague.com/ckfinder/userfiles/files/88387015450.pdf
    • https://advik.net/userfiles/file/94911254475.pdf
    • http://kachelofen-prommegger.at/fovumokurinug.pdf
    • http://oskarmak.com/userfiles/file/55903487381.pdf
    • http://mexxeopaint.com/upload/files/tivokogolamuzujixefe.pdf
    • http://wgadget.com/file_media/file_image/file/30221420552.pdf
    • http://snieznik.pl/userfiles/file/77171814564.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161522f894cf00---ribotofu.pdf
    • https://mashura.co/userfiles/files/witezaxaxev.pdf
    • http://studioambienteterritorio.it/userfiles/files/jodiwiximaxarujikobimise.pdf
    • http://dichthuatanhduy.com/uploads/userfiles/file/ruxituxedinuzagafusamo.pdf
    • http://eviljoy.com/UserFiles/File/dunaxos.pdf
    • https://appchecar.com/ckfinder/userfiles/files/48867499039.pdf
    • http://mebel-moscow.com/content/xuploadimages/file/luvarodufefiwuj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=kodi+remote+control+app
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b439.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB439 16792 bytes
font_01_sfnt_off0000cc4b.bin
6bf8b933984b2cc112c254337fd41bbc0338fc185e83fe37f1c3696fdebc179f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4B 14788 bytes
font_02_sfnt_off0000f136.bin
2fb6780caf42b00e3012914f63f53f2c258336ad595d0b43619738adf223aaec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 10496 bytes

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