Malicious PDF — malware analysis report

Static analysis result for SHA-256 6faecaa9f2abfcdb…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 11:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9a7ad67ec996f7cd3eb827d643669d69 SHA-1: 6ce5c429bf6408da506cfc0ab856ea711bdf80c0 SHA-256: 6faecaa9f2abfcdbb3a33a8e5fdc19ca131847311888e4bf1288f743dfc7fab7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript, which is a common technique for executing malicious actions within documents. The presence of numerous external URIs, including one that appears to be a redirector with UTM parameters, suggests an attempt to lead the user to a malicious download or phishing site. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into initiating a download, likely of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=apk+3ds+emulator+android PDF link annotation
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/54942941909.pdfIn PDF document text
    • http://ty-int.com/files/files/povul.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/1146752616.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/81101001398.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/j3er3rih022oig155rdf0maisd/xajop.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/linuwab.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/rafiwadowanavewevebam.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/88073513948.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109011405287067.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/fotaluro.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/63213653977.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/fosovunasidunudizobi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff46f4d9fc---kalawabewilenajorerekob.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/dubelasenudixuzagujes.pdfIn PDF document text
    • http://rc-modeller.se/images/file///wetozefemigafako.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/zaxolelegaw.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/33713650598.pdfIn PDF document text
    • http://idcla.net/upload/files/jilaraluketider.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/9666239749.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/bakipa.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/84121326427.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/tiserazunugagunub.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/75530113433.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_off0000e0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 18508 bytes
SHA-256: 2de5bad552ca401c72d66a72b367667afb15d68a7bfdc3cc4a6f648c7a707d09
font_01_sfnt_off0001100a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100A 10900 bytes
SHA-256: 6a573c957835341a0fd9ce30e51ce57350aa9911cea3cfca0b955f7fe0551c2f
font_02_sfnt_off00012944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1