Malicious PDF — malware analysis report

Static analysis result for SHA-256 0937fc5773bd5cb6…

MALICIOUS

PDF

71.2 KB Created: 2021-09-09 00:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: c5969d5da19444e54b7c93690c55687f SHA-1: b054d16b320e9206bdf52dede068fc05bbbb2225 SHA-256: 0937fc5773bd5cb69b3a502a829e50af94fc7114c07be4e33bdc63759f300a86
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://idrogastermoclima.it/Utentifile/FCKPage/file/72154135346.pdf In PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/mobuw.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/35895731219.pdfIn PDF document text
    • http://ducnhua.com/upload/files/53840142994.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/50406566528.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/mifalusut.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/10678397824.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/56035578789.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/logakagixiza.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/zuseniruxulukiponaxafule.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/48611761200.pdfIn PDF document text
    • http://toroisg.com/public/images/files/10602755754.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/11599004989.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/58239694699.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/96796918295.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/91764717478.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/kolopun.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/pijunoluf.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/85544902917.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/juwikugoliz.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/44165044807.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/37359030851.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/40132351031.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/12760162500.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/40367019371.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/wemedenixat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tubemate+youtube+downloader+latest+versionPDF 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_off0000b505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB505 16088 bytes
SHA-256: 87cb7ecef6b907842cea2b6f31a46f4c44c83fe7ee85acb14147e9cb43ea8e1d
font_01_sfnt_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 10876 bytes
SHA-256: 048864228b0a849fe8039cadce6984fbfc82899c682ed44ddf8a2214c007a1af