Malicious PDF — malware analysis report

Static analysis result for SHA-256 11adf5a5a4367ecb…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 02:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dac02b69b6fc50f8cd5210a1cde3bdd0 SHA-1: 253b8762f585c4b4b7b1f031203cf7e348e2daf2 SHA-256: 11adf5a5a4367ecb9dcbc38f748540e98ca7391e7784887e0cb0dd3b31d89b22
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying it as a link farm on disposable hosting. No scripts were extracted, but the presence of many external URIs suggests a primary function of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=gestion+biblioth%C3%A8que+android PDF link annotation
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132f14e79276---36770627899.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/juguwesenonexemetojilat.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130ee4600374---jetipefawob.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/45401496097.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/34015928188.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/55033933921.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/lesajogejidakasepesare.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210910003437.pdfIn PDF document text
    • http://ed-union05.ru/files/file/monogitiderobisuxikujed.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/gipamipitokanulisid.pdfIn PDF document text
    • http://fpole.ru/sadm_files/ripabirekatuwaka.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/85640733282.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/58969172560.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/98238872488.pdfIn PDF document text
    • http://mqskin.com/luutru/files/51832091857.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/6638003481.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/61198488434.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/kixuzoledalib.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/puxajokipeto.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/19475028580.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/35678285073.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/80918489492.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1631008136cf3aca45a777c9bc0430.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_off0000db49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 19508 bytes
SHA-256: 74bc6696dd10f84e67f966ab865f5f86948ae25abd420c8bbbdc909790681a5a
font_01_sfnt_off00010c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001247d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247D 10928 bytes
SHA-256: 9b957485b9bcd22f685922918443176ab1361c195f127c459e8c6290d3834659

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