Malicious PDF — malware analysis report

Static analysis result for SHA-256 4016933bb93621b9…

MALICIOUS

PDF

90.6 KB Created: 2021-09-13 05:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d6925500176e39f8b84de47bd696096e SHA-1: 00d9eff51750eb46113a6017371036621f28a06a SHA-256: 4016933bb93621b90ec50d60fe31bfe87cb8eec8f545b2a61c3c7e7719c74fd6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://studiomilano.eu/userfiles/files/59288341190.pdf In PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/30691215092.pdfIn PDF document text
    • http://scsytech.com/upload/files/70367292078.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/25385611740.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/94999542167.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/8360821327.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/naxol.pdfIn PDF document text
    • https://slotpt2.com/contents/files/95788605515.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/lebedaboduzib.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/16225004797.pdfIn PDF document text
    • http://pk.mo/userfiles/file/26696550942.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/mepewelepokisukogizenuju.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613338fc34b15---wopawirovosudirukuwi.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/88443011613.pdfIn PDF document text
    • http://tradotel-riviera.com/file/jenem.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/kazupokeri.pdfIn PDF document text
    • https://onecre.com/images/content/files/88027467148.pdfIn PDF document text
    • https://motoralbini.it/files/file/dasadis.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/1311629984.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/pizusezupefotu.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/domekipifawudufajatona.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/kagubabamodiro.pdfIn PDF document text
    • http://hainfelderteich.at/tokipafuzum.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/jadaburule.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/98665885803.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/18363c4d43d489b6b2a066c1562fc457/42221068264.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/4037065179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+broken+code+book+1+pdfPDF 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_off0000fa61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA61 10396 bytes
SHA-256: b14de1158f40b305979d54e9478f1c63f96041d3fb8f3fb0195516ca00ce99ea
font_01_sfnt_off0001119e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B0 19796 bytes
SHA-256: e5bc5d2c6a40a6edec5c02a62aa3da87fffcc4e44c2ecb89b56487802a634cd2