Malicious PDF — malware analysis report

Static analysis result for SHA-256 33dbec4b7595c291…

MALICIOUS

PDF

85.2 KB Created: 2021-09-24 07:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 10b22cdf277f20583e341eb577340b3f SHA-1: 1d4a894d58c72cd112fe7a29ea2260ce7d406335 SHA-256: 33dbec4b7595c291fe452e354351fe43d70ffe1d6d4736b1fff5ff4c7f06b276
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 and form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fongyoskert.hu/userfiles/files/27447630351.pdf In PDF document text
    • https://tortugafilms.ca/adminfiles/file/nenotuta.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210907142511.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/32997739250.pdfIn PDF document text
    • https://fuoriscena.eu/file/9514023409.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/movixizinodupixuwidab.pdfIn PDF document text
    • https://architektor.ru/uploads/file/dikexizimidoratud.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/56264838499.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/pokemepabilugajixoguw.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/98177964971.pdfIn PDF document text
    • http://weldingplaza.com/files/file/muluf.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/56765639820.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/gofibebinegozejamasut.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210902112638.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/51430624987.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/kigasavumitukesezuw.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/51319125741.pdfIn PDF document text
    • http://apex-architect.ru/images/file/bemozopiwusubulujudegax.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/fijukotiduwuki.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/78880380854.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/gizejilexoxuz.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/voretulu.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/xemajaduwosife.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161462a48daa0b---rujoginesilaxovetafafiraf.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091305504799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=andy+emulator+download+for+pcPDF 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_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 17572 bytes
SHA-256: 28ed65b5fd7bfb8f5b5b8c7832f9b034c0c037193b5bd02d0fc0868995b9438e
font_02_sfnt_off00012e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E05 10804 bytes
SHA-256: 3dcc43ae1a782b94a5824c403d96baf71c4b29cc03e47e23cf0fc9c2bde9e41d