Malicious PDF — malware analysis report

Static analysis result for SHA-256 0546575e8655920d…

MALICIOUS

PDF

97.4 KB Created: 2021-09-13 18:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f48106fdbd871aa3d25ed7f9a00d4ea3 SHA-1: e313251ab2641b1b2be3122ff80d12fcc0c9cc42 SHA-256: 0546575e8655920d70ac53a5ab6965468677cae4d418e775725353df06c4ab75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users through multiple low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://crysiq.ru/uplcv?utm_term=bot+box+tv+apk PDF link annotation
    • http://elektromig.pl/userfiles/file/647101602.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/19140382491.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://brainbond.ro/userfiles/file/61719935439.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/7019550205.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/47034107836.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/tokagusidakavemub.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/pofifovitoz.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dcfa3e7fb---zulunasozo.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/4212158728.pdfIn PDF document text
    • http://didula.ru/img/file/12303088644.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/31225801293.pdfIn PDF document text
    • http://africareview.in/userfiles/file/671665077.pdfIn PDF document text
    • http://pronobile.de/catalog/file/7317318206.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/ratoza.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/dapavowodome.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/xekusezubaf.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///bitezalixuwodipamugumoma.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/28392311678.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/fakp8uff4h9om42401obp108g3/77573921898.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/tefikifekitazij.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/61390905593.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/fepevonajotapaduwekegut.pdfIn PDF document text
    • http://timebymtm.com/upload/files/56487528181.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/43652203582.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/99609100071.pdfIn PDF document text
    • 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_off000115ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AE 19828 bytes
SHA-256: 99210b2d383dafd8df9845e8e7d744611b475a55cd1156206e31c5b97e449a97
font_01_sfnt_off00014965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14965 10056 bytes
SHA-256: 2b0fa4ca1883620013d7bc630c162c4153375b1705ecef38d3e293ae6d16544b
font_02_sfnt_off00015fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1