Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1dd4596e8aad16e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 14:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 866bcc1b0bd8a04e607c0fba42c8182b SHA-1: e10790cfb3d4d2763f8908f86bfc24100234807f SHA-256: f1dd4596e8aad16e4deb3dfe88340015602597472062752297366c4226e2eac3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to redirect users. The presence of these links and the overall detection suggest the PDF is intended to lead users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://fabrikando.com/cmsimple/images/file/rodokopolawabulejudetexog.pdf In PDF document text
    • http://refpecsbelvaros.hu/kepek/files/pezejas.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/penunifumawezit.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/vegajezekutefafu.pdfIn PDF document text
    • https://cecprint.com/images/file/nenubilatizazuz.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/viwoguvukeruweralimaveb.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/48601867041.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/79055951706.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/gigevutozimunokerogazenaw.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/sigikusivexosufokirem.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1f2ec7369---5263268337.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/zepid.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad978282a---88200752259.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/zubejagironofenu.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/50337057581.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/94740332658.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/werepa.pdfIn PDF document text
    • https://le27.fr/docs/file/41374591327.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/fibudozawubuxoruwelexukap.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/88312257980.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/dujiteguxago.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/xapanufemurije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+video+editor+for+android+2021PDF 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_off0000d6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B6 10712 bytes
SHA-256: dab4f6371743e0c448cba86d8483dee783d8d338dce9ec6eebb23aca6670bd5b
font_01_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 17688 bytes
SHA-256: 0f60f7e22baf4e5721c09af530922d1cc22093757300036f22126a7eadc0a521
font_02_sfnt_off00011d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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