Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5a9d5bc150838a…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 12:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 99a02a077ac76f201c8bce4bd61149a0 SHA-1: 9a9105b606300be439fb6683098463eb4c5e7655 SHA-256: 2d5a9d5bc150838a966329cece0bd50c6377195f846c5babf40d02957704b422
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable domains, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://samsunyapi.com/userfiles/files/95727043460.pdf In PDF document text
    • http://szerecsen.hu/editor_up/sufig.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/fixus.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/zagifutofelorer.pdfIn PDF document text
    • https://kaimano.it/file/63317799189.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/sajopabesaguv.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/67510424543.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/37947754458.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/24437446925.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/93479829363.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/vexapowewilidekifujeveg.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/kufuligifon.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/sepofukidilokatisuxubexul.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/89435838775.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/kbs2f8e4oc18aarebh8c6dijrb/62857091674.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210914_79774850D02C1151.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/78687932573.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/79397503864.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/74095953486.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/54395927128.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/mamivuxifanowomibepojosev.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea6a13716---20560221194.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/27015798951.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/lemurazaparud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=emotional+intelligence+daniel+goleman+pdf+downloadPDF 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_off0000cc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC12 10764 bytes
SHA-256: e4f78a8ad847506f7fb2316dfb6a2c0540640560f97e84f007ba16104434b518
font_01_sfnt_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 17180 bytes
SHA-256: 2cfe6fd80bce19649f1b9ae6d778c8291e98d7866df83fec0b9156023e611d20

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