Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7c33ae8eecc6ee…

MALICIOUS

PDF

81.1 KB Created: 2021-09-24 00:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 529f5237b601c449621a8efaa01d8e26 SHA-1: b88b0b92c4feca6ba9d9500746c7c098e42868c0 SHA-256: ea7c33ae8eecc6ee3f267c0bde18a6d42de3d0822bffa92eec0fd21c2f8773a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to potentially disposable domains, characteristic of a link farm designed to distribute malicious content or phish for information. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://spbmedax.ru/sites/default/files/uploads/38236425064.pdf In PDF document text
    • http://maroba-zirndorf.de/file/maregudasu.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16148f6345f444---xaluwoxiwukixeriwipob.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/22438735844.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/8381128155.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/35889393270.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/vugemagetinomufojim.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/budediga.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/8880611119.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/78152929527.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/41046480383.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/xarozepovofobuxudig.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/finokopabinerikonepoliba.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/janoposag.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/fikawanegujones.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/vegafezesakapapumorulol.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210917094532.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///91147034704.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0754bd75---90766691662.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/kowawusotobanepuzuperivub.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/sarupa.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/91402855185.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/banebatipugariwob.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/47237263830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=system+font+changer+apk+no+rootPDF 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_off0000d4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 18656 bytes
SHA-256: f04e28634ad6d6ef387ba3871bc5607517ee33dae88c1734734b7f75dd166c53
font_02_sfnt_off00011d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 11072 bytes
SHA-256: 2b619a2e116753340764f9ba40aad8a449314cd9bfc28c05bab1188f8cf661ea