Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4cac7eb866a8a9…

MALICIOUS

PDF

85.8 KB Created: 2021-09-09 01:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33e5a93af163a0fd80f4508dcabec916 SHA-1: de22fb4da48520f90c73fc94c203c091aa66f046 SHA-256: 5e4cac7eb866a8a991cbe9ab3be5acc5ec0ebba4f02eb236f74e48f09bd3324d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this purpose. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://inwebjor.ru/uplcv?utm_term=remove+app+names+android PDF link annotation
    • https://tecnibat.net/uploads/archivos/37566528272.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/32541332447.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/54960353260.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210909_100DF90F03D18205.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/74725908380.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/69693403628.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/94808384224.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/xikuzepofudajox.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4617e8b2---rorudikerapaxibazuj.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/51155753521.pdfIn PDF document text
    • http://bjjiffy.com/upload/tozagalejagedulabu.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/58321297625.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/gesupobasotezabuneza.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/pidotowozesapemer.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/sadiluxafaragesuwoz.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/3470215005.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/86047564763.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/rixokok.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/futojojolavabelisis.pdfIn PDF document text
    • http://eva.am/files/1d84fc7185492e73.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/14328470509.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/88325904098.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/53982029355.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/zojekewepa.pdfIn PDF document text
    • http://sgpeo.pl/users/file/rizipuninuguturepazus.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_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 10520 bytes
SHA-256: 5db1b3e8f26b10402cdf081aea2200fe0ef7f307427bb0725d2b8aefb1cc7b26
font_01_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A84 18056 bytes
SHA-256: 38559d985d25d087913dda0d7efe8d691247012efd3706aaf7049673eb81f79a

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