Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90a931debd2a69a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-12 22:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71929ce7d0bc0502c1be2ffef385392c SHA-1: c42ddebd0bac90f66d51893f36075d8ef65d7db2 SHA-256: f90a931debd2a69a692348321ff60f7627f1a7288d2be2d18c7d9c55bf4606f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous distinct URLs on disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://print-printonline.com/ckfinder/userfiles/files/36717416679.pdf In PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56665075707.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/65071819259.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/renijumuxikazafuk.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/kezulisuvexogusivome.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/4440455096.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/kejusufap.pdfIn PDF document text
    • http://belloverde.net/emailer/file/88382793711.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/3379296673.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/3156140315.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/52935287390.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/xesitimeke.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/73dcb66b3bf62e106b967284f2e23c43.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/tojogurenimuleluk.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/23344306880.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613444a49b478---sajavurogepatatiki.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/7316532540.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/dp8ro76v0ka9daaufqud0b55v2/saxumofenigemadur.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/dupumalumojilevevekijup.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/xugob.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/32827080013.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/mibekisisitufevevuretozak.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/govaze.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/13809354758.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/97322718124.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/29834070943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=jurassic+park+fallen+kingdom+full+movie+freePDF 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_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 11116 bytes
SHA-256: 944ea8e989fd5e57740ab3702cf5fae75929c67c21575db09c5f6493896be885
font_01_sfnt_off0000fabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CE 18816 bytes
SHA-256: 6249d94f884c1e73c5a2b4cbd36cab844e18826e9e6cba7b68fa8dbd0664ab87