Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f26e824aae435c4…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 07:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 62a18f84069a852e925914d45a16f6bb SHA-1: 03803e7e30d1732064be198b6783510fbf05314b SHA-256: 8f26e824aae435c499303a3ffb4f967006c4505c2af9ba0579dbe6d7eed45618
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis identified it as a link farm, with numerous embedded URLs pointing to potentially malicious or phishing sites. Although no scripts were directly extracted, the nature of the link farm suggests it is designed to redirect users to further malicious content or exploit kits.

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 http://officeharbor.com/pdtInfo/57668460537.pdf In PDF document text
    • https://dpdpunjabi.myskoolapp.com/FCKeditor/FCKimgUpload/file/38018793682.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/22912319595.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e4453c5e51fa1de7008a49e9304776ca/virikavozigak.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/vugewufuxu.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jexoj.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/dorowivowofipu.pdfIn PDF document text
    • http://ed-union05.ru/files/file/29736504355.pdfIn PDF document text
    • http://cuiquji.net/d/files/6992209285.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/masuxumoretisageviso.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/zirovifowegabit.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/16115767846.pdfIn PDF document text
    • http://csp.hu/editor_up/sebaso.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/taxujobiju.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465d6978918---73636454924.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/pikipu.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/33480556291.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210910091943.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/94873834745.pdfIn PDF document text
    • https://gilbertems.com/videos/file/9652064735.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/961706534.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/wiwuvob.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/40718374993.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/jonukap.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/42653854011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hentai+game+rpg+androidPDF 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_off0000df90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF90 17644 bytes
SHA-256: 78a301cc74c6faec85967c3908944bf6d76f8e1b128a86087f368304dc3f3457
font_01_sfnt_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 10512 bytes
SHA-256: 0717fd28f8ac491f1e15341b84ffb0ba373e2d91c4b614515d6d27615edba5f4
font_02_sfnt_off00012546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1