Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89ca66f96877cb9…

MALICIOUS

PDF

75.7 KB Created: 2021-09-21 03:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2335afa14c7edcadc59003221b280608 SHA-1: c906e83778a0fd59d744d8d240ba4c80f28ad148 SHA-256: b89ca66f96877cb944df54683db940e83cbce1fac0c1a6c6c363f073ac3bb58b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of these links, indicating a link farm on disposable hosting, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=accounting+for+management+text+and+cases+by+bhattacharya+pdf PDF link annotation
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/726542630.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210921_0108E40F0D790545.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/zelisubakujewixenoxedav.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109060834425190.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/jisegij.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/xopopinuvomupapasubone.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/66101162801.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/sejoxotifedakineloxi.pdfIn PDF document text
    • http://donghotam.com/luutru/files/2636084115.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/75632994616.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/48492723715.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/sajafegufinu.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/texitupimidodu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e17c0e2a66---xumokukipovareratezo.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/10405599226.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/pixapuxelujegawopi.pdfIn PDF document text
    • https://ienter.bg/files/64132822943.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/nasavitevarexixunakidope.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/fotasefugepozakumafaniw.pdfIn PDF document text
    • http://contelex.it/userfiles/files/71897776737.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/91017582779.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/40612160175.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_off0000c155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC155 17212 bytes
SHA-256: 9504196177de3f10a0dd307d32fa34e75a60fb51ffbeeda25bf89d06c71e6502
font_01_sfnt_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 11460 bytes
SHA-256: 7b4088ae997a840ae69c9665c185589e97664ffa369b9aa02965fe1c4b1e96f9
font_02_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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