Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4d2b9de317c80f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-16 06:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3aa3402780e3d9ded0b8d43632494be9 SHA-1: 8196c0204c1998415774bff8cda4573a9da40a6e SHA-256: 8e4d2b9de317c80f534109b4adc285050481f03e05a68408c4a7d6abd6dd3a92
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to host and distribute malicious files. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.
  • 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 http://idcla.net/upload/files/jilaraluketider.pdf In PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/sexakik.pdfIn PDF document text
    • https://greenways.at/userfiles/file/46234173073.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/visarenuxumasoma.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/79183445007.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/54981016059.pdfIn PDF document text
    • http://laserinnsbruck.com/static/75214489527.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/vanirubelivetaxulek.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614237dc3a65c---gimexagevemakajewimitoku.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109140312238087.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/mowadise.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/71057446928.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/9583422192.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/vunibotufubajumo.pdfIn PDF document text
    • http://snft.ro/media/file/53376608201.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8e4a2c863841da1a3a94ae0bc061d24a/nafafakazup.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/wazevajokolonusobex.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/45837440345.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/13675209716.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/51457812232.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/50813372468.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/gefoxudiduwukiralotaf.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/62578332165.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/81278449052.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/82516111536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=shahid+plus+apk+mod+2020PDF 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_off0000c573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC573 19592 bytes
SHA-256: f2441480494e6ae5417a1d560bf256284e05136b760f0cf6339536f8254be930
font_01_sfnt_off0000f7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEB 10732 bytes
SHA-256: d1f918afd0eddf01d4053a8fc1ec34a8f83812066761acbed0e69d89b2d58dee