Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae5163f34c20bab…

MALICIOUS

PDF

75.1 KB Created: 2021-09-30 15:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 071ed306c32898a27bb8bab51c6eeb52 SHA-1: dced4801a0edf5ecdd2ad3f73975ed093155a02f SHA-256: cae5163f34c20bab0c9a8c0e2f5b453d0f0146191dc15f401f44b2749e825694
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. It also includes numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lead the user to a phishing site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://oniceh.ru/uplcv?utm_term=6lack+east+atlanta+love+letter+album+zip+download PDF link annotation
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/88155967136.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4cc8ff0c39febd79e89b1b118ab61379/53083596663.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/76787137655.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/17419463645.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/doxevudarilumos.pdfIn PDF document text
    • https://gtpoznan.pl/cms/files/file/7735323083.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/lugetufoxukugesenijemat.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/fixupuwu.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/kupifo.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/80094176261.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/texexuwasimoloked.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/zaxuz.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210921213457.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/dijiwepagenupagebajaka.pdfIn PDF document text
    • http://ty-int.com/files/files/pedazi.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/debojegerewuzidu.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/fuxubefisejigisunel.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/40823079125.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/guvogerajilu.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/lozeseverig.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/tiwibaluwusixixozede.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/43380738629.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/47921691483.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/46269312027.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/79782776548.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/pabolixizinuvuxatowamogo.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_off0000bb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 18752 bytes
SHA-256: f0d037b4f9ea08ca560eaba08c47d9a4e55ec97b93f829334e5c072fc5173cac
font_02_sfnt_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 11292 bytes
SHA-256: b362f1c477aa8cbc30a19c91dec1dd90a322f972c3525a2fb213d7091ca0c7d5