Malicious PDF — malware analysis report

Static analysis result for SHA-256 e015d535689ff99d…

MALICIOUS

PDF

72.0 KB Created: 2021-09-10 20:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1fc866f2b9a786d25674b9781811231a SHA-1: 8e973298b228e2ab156b85d3d4c7c9b99987c8bb SHA-256: e015d535689ff99d99f8c8926c50239f8ce6a08426a592283f10d869ed4f62ec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of external links, many pointing to disposable domains, suggesting a link farm designed to host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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 http://zhongguohuachun.com/d/files/mexibiloto.pdf In PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e31edb06---76012233843.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/zexamesesodatoxikigek.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/pixisejejezapaxazeduled.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/lokadoporovajolaseberu.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/varofigikezopefevav.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/06f1a7c5a0224c2f712605741dbde252/24515900994.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/linumuwuloninopujubev.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/nokuwumenafaseja.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/werupunibunugosalorawil.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/1138829154.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/nofavaposogojediwukexapo.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/49908904774.pdfIn PDF document text
    • https://phukienbep.net/media/files/fajozisom.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/14105951833.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/78818122953.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/vojajofetesivagomagawipu.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/88110490311.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/179263212.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/molubabuvupiwodoz.pdfIn PDF document text
    • http://npas.ru/pic/file/84930182575.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/dazekoriduvo.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/finuxedepetatijeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=joseph+malayalam+movie+torrentPDF 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_off0000b57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57C 10688 bytes
SHA-256: 020cc188539ec00a72b7dd4b648d2501e54750d331375450979d506cb5615a62
font_01_sfnt_off0000cdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDA 17176 bytes
SHA-256: 0af55c314ff92135bd7eda038a3bf9872d2dedc8393727cf1d1bab5a08b3de02
font_02_sfnt_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1