Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9812390febd47f6…

MALICIOUS

PDF

71.6 KB Created: 2021-09-10 13:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6e1a73214062f8475bb94e8a0b41bba6 SHA-1: 8711b08eb48ba699cedd46b6c0b14783401a0ff1 SHA-256: c9812390febd47f67b0a0f68e0ea5e95111397e5cf805244c118a042fcaec746
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to various domains, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=android+factory+reset+sd+card PDF link annotation
    • http://thedewakohchang.com/image/upload/File/imonopuroxor.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/3134728087.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/88377151954.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/68434228266.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/84028500658.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/51247524270.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/55s0226ib0hd9vrt2chli01dhl/wusaguvot.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/61961681446.pdfIn PDF document text
    • http://imaginove.eu/data/Files/donudesodeguke.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/31640614469.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/32787447644.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/virizo.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/zaboserojikewexigop.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/vamobakow.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/40384435975.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/54559791534.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/22438036328.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161307ce0bb309---44035285068.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/niluxoz.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/xugimumovavefulorip.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/84737385582.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/38663878245.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_off0000b81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 10516 bytes
SHA-256: 7980aa79590fab520f8fe5952c1fec12928287bf11e928bf38aced6ad9a8e3f1
font_02_sfnt_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 15880 bytes
SHA-256: b11ef41f4f0f2fe075da9f450749ada6881a030ae6c74d5ae560f41c44617674

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