Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffe17b8facaef8f…

MALICIOUS

PDF

82.7 KB Created: 2021-10-05 01:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4f25e5364abbc4288bc58562d6e8b956 SHA-1: ce8658dec4f902e3e649b17b20dfcd3aae041bce SHA-256: 7ffe17b8facaef8f9084d75aa60e4fe23618919fed0ff0fb5fa15c0486e0d9fa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing a second-stage payload. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://bjerkelunden.org/content/files/userfiles/file///lulawakugubumovakif.pdf In PDF document text
    • http://aaykpn.com/uploads/editor/files/53505526125.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/17143115729.pdfIn PDF document text
    • http://holztreppe.pl/userfiles/file/batuganolasivo.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/23303776893.pdfIn PDF document text
    • https://botroul.be/uploads/93415726131.pdfIn PDF document text
    • https://binhvi.com/upload/files/72527647140.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/26394693898.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143a315a0a9c---44827342002.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/77f88991c35b4040540b29c096163d5b/newaj.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210917_194725.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/kokinojerepapixeg.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/sikefokasasoluraxava.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/57126096356.pdfIn PDF document text
    • http://tykhchem.com/upload/files/zesatugusu.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/kamaxumidiga.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/97419843956.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/pasol.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/losiwen.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/piborogutozosupuvak.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/kusupiketuwi.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/70195583876.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/83346222329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=meaning+of+burlesque+in+englishPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/tiwoxuvukixujetapufen.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_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 19600 bytes
SHA-256: e7bd9f5f6a6cc74ffc3e4169286d04a35ab9e754334777cb89c88c85b04905bb
font_01_sfnt_off00010cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CA 10772 bytes
SHA-256: 5b42171d2ca0c15d57d7215bbb6b3ef7e0d403a82df9886e612cdf0e6ebb130d