Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f3ddd0f662150a…

MALICIOUS

PDF

85.0 KB Created: 2021-09-15 08:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7990ee88a7d6cd9031a30dbb27dac532 SHA-1: 924b0c5b1686b8dbac802b707aba5988c57014e1 SHA-256: 73f3ddd0f662150a34110b950b98cbcf44245a9820d0611d79d895349fc7cfe0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The presence of external URIs and the link farm nature point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=owa+for+android+app PDF link annotation
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/57648341262.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/69122718674.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/pexoxatuwo.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3074c809b51b9dc2707a0f3c55867620/zikoxupivezomizotesamudix.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/tewifisasatat.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/98839838022.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/sonewutufum.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/tuposinezexikotepuxif.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/70808836949.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/zujeli.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/11561364573.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/walidonejugigewulurubunav.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/33804237606.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/vofeluxapunot.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/godotokibuzerupejevul.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/nomalatukawowadororojax.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/romojijamekusisalujinixa.pdfIn PDF document text
    • http://simonide.org/userfiles/file/karaxutugorunepotut.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161416e61610e8---59402090579.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/zalavuxapotefis.pdfIn PDF document text
    • http://anindecor.pl/files/file/betujawalanonul.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/91947298434.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/33447702641.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/61668932341.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_off0000e86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 18056 bytes
SHA-256: e0576106b37f7a489840b62e243dde384027f22144b6e21b4b7e0fc36e4ac450
font_01_sfnt_off0001175d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F74 10160 bytes
SHA-256: 10e3831de018969973d3f688f1100fe6a8de7f8eb55c7ca0662905b6d72e7116

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