Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5103423a55b480…

MALICIOUS

PDF

70.4 KB Created: 2021-10-04 10:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eb8798009c136498a2d913756f4cc471 SHA-1: 420772f0cb38e2d5dcf56eaa0e1f996a846a615e SHA-256: bd5103423a55b48047d45ec761602fa3fe89f589aef4d347a8c0b30563666815
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, with one specifically identified as a potential redirector for phishing or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF structure and embedded links suggest it's part of a campaign to direct users to malicious sites, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://nomylo.ru/uplcv?utm_term=ppt+on+integumentary+system PDF link annotation
    • https://mjrspot.com/fckimages/file/90606968336.pdfIn PDF document text
    • https://nasikampung.info/contents/files/malawixaduxevifuj.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/39066549267.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/kekadajimatoxig.pdfIn PDF document text
    • http://elitacasa.it/images/file/woxaxefivejuxonubevew.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/buluwozuxadagavapejukep.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/pumor.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/dovaxodadufi.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/67904100893.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/vojup.pdfIn PDF document text
    • https://csn-alliance.com/data/files/deribuvubivaxokevojomowex.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/tuwosedujax.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed7a6c7f6e---60473049501.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/wewuvupawetixugi.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/diler.pdfIn PDF document text
    • https://suruburi.net/mm/file/64235191529.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/63634318858.pdfIn PDF document text
    • http://maihome.hu/admin1/file/vixidesusufetadusamuju.pdfIn PDF document text
    • http://sun-tes.ru/files/file/wemosizavevona.pdfIn PDF document text
    • http://pinxedien.net/upload/files/1257369330.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/15645551954.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/aa96eed212412a4d80bccd8a4a4e959c/3884528283.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/rapekewenidujununimezur.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210930_1FF50E7B211CF424.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/fatekowudax.pdfIn PDF document text
    • http://coolscape.info/images/files/wajowumotuxexonasuxoz.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_off0000b146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB146 10764 bytes
SHA-256: 6d5670a6cd8ac5177878810ed5d831f0515badc20246e44f23fa0ea301c47f54
font_01_sfnt_off0000ca19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA19 16364 bytes
SHA-256: 7b9207e08d285604003d6522cc37774c276266cc4392dde50bed7e569a7b0fa8
font_02_sfnt_off0000f3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1