Malicious PDF — malware analysis report

Static analysis result for SHA-256 4202850900dc0b7c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 10:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a815dd097d6c869a3ab631fde6e6b822 SHA-1: 724a8426a594f703d8ef1625c8f154effae3660d SHA-256: 4202850900dc0b7cc33691b1f8c06f33b8f62f9fe08fa1fb1f523694b3164ec9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and exhibits a high ML classifier score. It contains embedded JavaScript and numerous external URLs, many of which are hosted on disposable domains, suggesting an attempt to distribute malware or conduct phishing. The presence of a download button lure further supports a malicious intent to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • 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.
  • 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://laborke.ru/uplcv?utm_term=trivial+pursuit+apk PDF link annotation
    • http://zhongjiukeji.com/upload_fck/file/2021-9-9/20210909113604148297.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/11809503803.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/17894074514.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/8390096432.pdfIn PDF document text
    • https://hgb.se/filer/file/15213738239.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/wedipomemuzivemazu.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/bejibaz.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/53361715361.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/galagipoza.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/migazimuxajuwe.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a912117d4---10809370503.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/pirigotulexororifi.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/60717688529.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/bumexafakamibex.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/3818292762.pdfIn PDF document text
    • http://18554080.com/userfiles/file/posabikitosevuvusife.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613998f88b699---lalavenegapugajiwunori.pdfIn PDF document text
    • http://intertravel.hu/_user/file/10424305288.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/94752861853.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/kaposufufogolezuron.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/retukin.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/woxizonezogavi.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/movupizororozimit.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/85974080889.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/fozolinu.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/zaxedusababifipopasen.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_off0000d824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 10108 bytes
SHA-256: 567bc2c9fa4e064c37c64f86e7fb53f09a6230e1752566b1e50c0d60de616eec
font_01_sfnt_off0000eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 19536 bytes
SHA-256: d56d89b2813148accb3f4cf6803c9e73034a720a19cf90fde142426ba5b1384b
font_02_sfnt_off00012138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1