Malicious PDF — malware analysis report

Static analysis result for SHA-256 7890d204710de870…

MALICIOUS

PDF

69.6 KB Created: 2021-10-01 10:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a77ad3207b701e16068438f7eaafd3af SHA-1: 05f856dccca131b60b169f91bafa1822ad8ef20d SHA-256: 7890d204710de87045af9ca97e93cb7ec14208cd86eadfe9921103c6088fc5bc
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 pointing to potentially disposable domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of distinct hosts with few links per host, reinforcing the idea of a distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://weingut-suppan.at/files/bipozobetofadonuf.pdf In PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/kodik.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/namuxopelodux.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/45591241627.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/memizamupelufuseve.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16150015923bd5---48306531924.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/padewobufutenenoz.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/muguvaxopemularudepam.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/tigawevibadivesilifisof.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/pejojev.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/titutugoxuresowumufo.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/32802481480.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/gusepizeridi.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/37490401351.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/95022825850.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/nejiwep.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/58632829604.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/miwamapukisonawomuwupanej.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/27545201939.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/buroxurutamuxurisobarofaz.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/13055825951.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/famekalozuliroladi.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/zixakowi.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/42273454640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=periodic+table+of+the+elements+metals+nonmetals+metalloidsPDF 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_off0000b222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB222 10884 bytes
SHA-256: 2f966eb2b6c6b0bb0972e3863bf5d1a3cfba4e2645cd21a02598af2dbaab8c13
font_01_sfnt_off0000cb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0E 14716 bytes
SHA-256: aece51264ecb6770f8dc0935296ba96314650893704706ee1feeb9c4825ed8d5
font_02_sfnt_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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