Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3656c93ee5d56a8…

MALICIOUS

PDF

69.3 KB Created: 2021-09-29 14:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a17451f54ad6f4a795b62af27ad865ed SHA-1: bf569ee73c4510c7724c4f72e51bd4c7424ba03f SHA-256: e3656c93ee5d56a874977482c0c93ccd5a582623de2937f1ac885cb23cb20cbb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a medium-severity rule indicating it's a link farm on disposable hosting, and a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://synerhu.ru/uplcv?utm_term=vlogit+editing+app PDF link annotation
    • http://romangruszecki.com/uploaded/file/72262983175.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/sevex.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/milukukelabubebepogoke.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/7459078342.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/92772878457.pdfIn PDF document text
    • http://hkwwta.org/userfiles/7097824995.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/xifixuxekijaxage.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/nebasafejasuvuselubalesik.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/wasupuvugura.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/43196769065.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/dikilulaporaxolalipuwipe.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/15995269508.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/77653630296.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/80668571510.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/pugujog.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/diriwavaker.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16145c185ca704---barufovopin.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210904071916.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/gazanoxikomirinevegamame.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f10486c847---73720422208.pdfIn PDF document text
    • http://effektfilm.de/files/file/majivoxozegat.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/kajosamawox.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/fojawoxajibumirugufefagu.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/lujolebokitomo.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_off0000b1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CD 15524 bytes
SHA-256: 28b44c4faa3dd0e6236f7c66ca082f15106f9021ef2f28af51df45741acef513
font_01_sfnt_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 10268 bytes
SHA-256: 320366761928caab23febfe0eaff66a43b666d79bf1c701c9f23e68214aba7f1

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