Malicious PDF — malware analysis report

Static analysis result for SHA-256 619f5e0299e90de4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 13:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6c8b02a11300f91c557250ff506c53ff SHA-1: 459d9e2b6b0e397d3d9b3d6e94bf4e08dba4a357 SHA-256: 619f5e0299e90de41590663ece6a56b08d36a15bb04ffe319c21a5056b0b29bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall detection profile indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://msdoubrava.cz/foto/images/file/49599381933.pdf In PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142fc6cbeab8---20372488178.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/70361723105.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161454cba70c16---6970259739.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/fotonudi.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/xusometebexazo.pdfIn PDF document text
    • https://greenways.at/userfiles/file/35373485748.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/tunik.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/56034215954.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/90124889410.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/85936412685.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/7177631597.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/tazar.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/xubofazikag.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16306510021401071252.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/vugoku.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/futon.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/degelekunasagimuk.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/vilidumorin.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091702273373499.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/5058644307.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/buzopezazogexo.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/livibitozujinitojopi.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/47563286643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fmovies+watch+online+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_off0000d963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD963 17580 bytes
SHA-256: 628035ca5ab904104d3e03e6cd1fd0a5ceb9f8a20ea7fdd60143479a495dd9e7
font_01_sfnt_off0001074a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F61 10732 bytes
SHA-256: 3823569642bf5a6418f132efaf84b78e345b42934967f52169a462951a7c8664