Malicious PDF — malware analysis report

Static analysis result for SHA-256 925dc514e6209be6…

MALICIOUS

PDF

75.2 KB Created: 2021-09-19 02:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 760509eea1e881d90012a9f03a649121 SHA-1: 3a564dc16f2f1478824fa1da672b1824089dce43 SHA-256: 925dc514e6209be6ceb740028af104ea15f73f0cfb406b6fa3ef05423ef8bc50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous PDF files on disposable domains, with a high number of distinct hosts and links per host. The embedded URLs, such as http://xfswchem.com/upload/files/48040108690.pdf, are central to this attack pattern, likely directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://xfswchem.com/upload/files/48040108690.pdf In PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/vanugodasinofab.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/7410492964.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/lafamogimuk.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/lepovox.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/gazugidokonopojebaz.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/39622358862.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/xebamorivozere.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/paxelag.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/mujuwixevafodaxitovibuz.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/tides.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/34885014961.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/36656895084.pdfIn PDF document text
    • http://podushka.by/files/files/ragudiju.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/82777860950.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/gixutimilo.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/60877002097.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/61060270919.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/78014907525.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/kegokowamurizixubenobet.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/dubabu.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/90836580713.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/novujufanaxajakaxojilute.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/14085630967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=calculus+early+transcendentals+8th+edition+solutions+manual+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_off0000be46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE46 17476 bytes
SHA-256: 09ac641b4a7b61e20d98bbf8a8bedd4979492446cf1cf7c9d3b0851449cf21a7
font_01_sfnt_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 11336 bytes
SHA-256: 02c26496b0506c6d1e0b3d10c50009b90dd70e4742ef494a4b3b376502b18c58
font_02_sfnt_off00010633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1