Malicious PDF — malware analysis report

Static analysis result for SHA-256 828d6e302b02e0df…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 20:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1b2ce36412f6859b0095944590e7e9d3 SHA-1: fe120985daf7c496cc33fed6e6c768b880c0c202 SHA-256: 828d6e302b02e0df4d781332a3f506e9ba5fa5261b2fa43974975cd5a681f4a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

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://medvor.ru/uplcv?utm_term=how+to+print+pdf+from+outlook PDF link annotation
    • http://purepoem.com/resource/docContentImg/file/2021-09-18/43059706f4ac55523ed957cb45db60f3.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/85056962577.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210913_8EA5BCF142B4FCCE.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/62856005542.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kazafoxuzujet.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/xulepexo.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/32678930956.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613af9b5bc8ed---69844042909.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109051220204904.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/nexatajurezojanukivep.pdfIn PDF document text
    • https://primer-spb.ru/files/files/65880095492.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/39195598621.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/12885678643.pdfIn PDF document text
    • https://rotitelor.com/contents/files/podizone.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/zitugabufedumiguzilifop.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/fakes.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/95093317210.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/ruxupozuki.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/doxukakewabagasibenod.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109190254424204.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/veteki.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/79764067952.pdfIn PDF document text
    • http://woykoff.hu/upload/file/gewuzipesabifo.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/wozozakidujum.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_off0000b1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E7 16240 bytes
SHA-256: a38cdaece81cbd55aea3c958c6b1f0962930b6c1455b6c96a03e8cb801fcfc73
font_01_sfnt_off0000dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 10468 bytes
SHA-256: 1c82ae31106f34d14a97b0f76c10831ff678785de5c2f8fb94b70bef70fc43e4

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