Malicious PDF — malware analysis report

Static analysis result for SHA-256 84494b85191bb662…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 17:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e6d371b80f784d385a6cdd4495b66e9e SHA-1: 62db6a0bdf35f35694f7379d174fb4bccdd83554 SHA-256: 84494b85191bb66283ef5bdfd7960285644730d66a1a3d8bda8f83909dec891d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. Numerous external URLs are embedded, suggesting a phishing or malware distribution attempt. The PDF structure and embedded content, though heavily obfuscated, are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=marketing+planning+and+control+pdf PDF link annotation
    • https://korvioinfotech.com/ckfinder/userfiles/files/tevuxugesidad.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210927_EF312C79C748CC66.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/kawiwilitetemuwa.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///zuwipuxalizowavatowi.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/powepareni.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/21544426704.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0451693001632654466.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/74410909343.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1da5d5873---93807180065.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/14112837101.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/teluwazujaresajiwimof.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/gopibebalesarosafin.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/vefilajidivotof.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/98814575577.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/41094611673.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/95508977287.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/68980544218.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/17070253631.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/penakiwi.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/24404273395.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/bidifam.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/33340378789.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614989423e3e3---51425974197.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_off0000af3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC750 16084 bytes
SHA-256: c49d68b52977798c76a525a4ab2128363ffb0a13c6830882d50aba49c65234a1
font_02_sfnt_off0000f093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF093 10712 bytes
SHA-256: 1d86a12dfc2d18211832674b7c5b33899067b8d4929847fae669f5ed699e0bd4

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