Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca5558e8e8878d5…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 08:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6af0133c7780b5aaf4a9643f0d46c17b SHA-1: c3c2a510c6a91503b7bd9b8d300ff6c4716e6d09 SHA-256: 0ca5558e8e8878d57d160a50f161dc76e6e3d5e4831925a5fc3defc2c875431b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code. The ML classifier and ClamAV detection strongly indicate maliciousness. The sample also exhibits characteristics of a link farm, with numerous distinct hosts and disposable URLs, suggesting an attempt to obscure the final malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://fullx.net/files/97301630828.pdf In PDF document text
    • http://hani-bee.com/userfiles/files/zinifijufodamitoronik.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/kowudofiwixawikenov.pdfIn PDF document text
    • http://leruichem.com/upload/files/gokogaremirejupunuxerum.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/1q13gglfje7h471ac9kp731nqq/bakisi.pdfIn PDF document text
    • https://italvaping.com/file/16246511783.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/bewego.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613017b3f38f2---femiwajuvakokadu.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/bazavofowojevipa.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/rozoruxowufekezosibaber.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/fuluxomolop.pdfIn PDF document text
    • https://atavio.ru/files/file/1725176346.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/3581579381.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/80850508978.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16141ffcfd83bc---tedafawazibuzowu.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/subavi.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/35643250617.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/43489978325.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/vokejiruruwiruvoxuda.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/piratew.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/kazeg.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/fakulikebulikizude.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/toxinesinomut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=where+do+we+go+from+here+chaos+or+community+pdfPDF 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_off0000c52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52D 11312 bytes
SHA-256: e94aafff435484fcae205f985ff01529cf94cf66364da40806817de98838ff71
font_01_sfnt_off0000df7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 16796 bytes
SHA-256: bf46047b4ec3ab2a1f04c57044a66b372eedaaa8fb12ae2a84cde52ab60e102d
font_02_sfnt_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1