Malicious PDF — malware analysis report

Static analysis result for SHA-256 216895d6cacb5ec7…

MALICIOUS

PDF

84.0 KB Created: 2021-09-21 00:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: be9c9c24f0266b5b24d45493c90d6e61 SHA-1: 92382b133146c9c8f340312c66113c123d1a5a2d SHA-256: 216895d6cacb5ec76750f569764b185ccb59a66ed52a47d755d8095929c0294b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a large number of links on such domains, suggesting a coordinated effort to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://powerfalcon.net/uppic/files/dologexadumiluwejuj.pdf In PDF document text
    • http://ilkyoukais.com/Images/Media/files/41709113451.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/29010614335.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/18332511890.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/mofusideligekatugabi.pdfIn PDF document text
    • http://vucert.vn/uploads/files/65906938494.pdfIn PDF document text
    • http://yongqingtech.com/d/files/xisemab.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/notevufugivuwij.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/koxavokagi.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021092102091781.pdfIn PDF document text
    • http://azizolace.cz/images/file/sufufomopegotoku.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/44169624586.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/66072352427.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/kefomabu.pdfIn PDF document text
    • http://beiks.info/public/file/2908469564.pdfIn PDF document text
    • http://melabo.com/upload/files/70710509743.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/17526990113.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/71765518882.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/kaxizogixibiz.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/25647473707.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/xebosirekesipikosenifife.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/13388588974.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b54d2972e475c402244a30ab62a7fced/vesomevokajefiwemagike.pdfIn PDF document text
    • http://corkpotters.com/images/sekarasudavuvekomeno.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147891b8140d---funogorus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=biggest+thing+ever+built+in+minecraftPDF 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_off0000e439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE439 17208 bytes
SHA-256: f7a35c673f5c47fbb30c0b1995ee4f649c938d4e85a5e7d6d1c5a51dea7678d9
font_01_sfnt_off000110cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CB 11020 bytes
SHA-256: 6aaa601e7c9338383473b0d44412a5a02e0a2f63d17b500fb0a611c292d6f9a8
font_02_sfnt_off00012a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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