Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a6718bd071f738…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 09:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d6b8de8ce196a15e161109fbc83714f SHA-1: 858a943e5a6f4616ab79cb0006770b7d1e808c51 SHA-256: 21a6718bd071f738382bafc9b858cc72a183355fc16945eed51e40657c30223d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also contains numerous external URIs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wych123.com/upload/files/66184771376.pdf In PDF document text
    • http://rabotatver.ru/userfiles/admin/42423803226.pdfIn PDF document text
    • http://cocoal.com/uploads/file/jupebubisati.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/21810171212.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/15865485491.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/81822164240.pdfIn PDF document text
    • https://edgecs.com/documents/91000752220.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/zivipojalopobowolepukesan.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/80879619376.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/94932415.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/72272068509.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/55973485652.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f803bbedd4---kowabuboxutajomo.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/gudasejesakiribok.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/2614673395.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/75705689420.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/72fa5ebe4b7e94a29c2ccf620d386636/gorirodikenewon.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/judelatop.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/60116850009.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/gisajixitebowenuzefaja.pdfIn PDF document text
    • https://85097781.com/upload/files/rojuletuzaxetosafoz.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/26474668918.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/kadugudifonelutomapexafas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=lr+full+apkPDF 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_off0000d349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD349 21248 bytes
SHA-256: bcd93c36316018c5ff45f17a23f4309b7d7cb3f3d842104d98bd42890fac7688
font_01_sfnt_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C9 9788 bytes
SHA-256: e2682e03f8c49f8276e98c71265ad8f188b27a2f559253ff75e70e411ae57839

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