Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33e84846143cf3f…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 07:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 210561dd038ab01f32b7d551156ed0dd SHA-1: cb570918f5a7e0670428be05a3cf0dafa2b5a734 SHA-256: a33e84846143cf3f2a5d77ccd971199f65bda61bc1373b902d5d2676109e277e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is designed to trick users into downloading a password-protected archive, a common tactic to bypass gateway security. The embedded URLs point to various PDF files hosted on potentially disposable domains, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://crewmak.ru/uplcv?utm_term=how+to+lock+notification+bar+in+lock+screen PDF link annotation
    • https://koncnc.com/genelresimler/file/10156300844.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/kiribefopanafadujobowe.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/lavibikolupowulu.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///19491945715.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/37469729865.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/b23c0bfa3f261642d704dc715c79bb11/xivafusisagun.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/97900258953.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/30097886471.pdfIn PDF document text
    • http://marketingnews.fr/images/file/36603771811.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/jifodapexa.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/pezonewi.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/87400942621.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210902_CE579630A0B5854D.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/72995877263.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/40934373816.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d40cc3166b---leselemogu.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67801158360.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/98235467725.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/guwejuku.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/7629790760.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/gegamatawomuzo.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/puxuxutetesakekosenixerar.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/16153895405.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/85983580522.pdfIn PDF document text
    • http://seamacros.com/upload/file/43310882831.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/26782928904.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_off0000d1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CC 20056 bytes
SHA-256: fffdf113528a183c3f40823b404591d3e52e8378ae9e0396793fc4c5fe368d69
font_01_sfnt_off00010598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 10636 bytes
SHA-256: 5374d3ad419412bcef54505b5ab9cf05aa24bcb859af09d246afeab97b25039e
font_02_sfnt_off00011e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1