Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f156a3d8724550b…

MALICIOUS

PDF

60.9 KB Created: 2021-09-26 18:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f89bba06176b2d022634ea95639757c8 SHA-1: cfd981df7749dce7d09c8ab581685f7caa721acd SHA-256: 3f156a3d8724550b7a782a556ea8feefd97398428fb484ed175048cda66c9fd1
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely for malware distribution or phishing. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7193

Heuristics 5

  • 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
  • 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=vortex+hack+apk+download+for+android PDF link annotation
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350aa2285b4---sifog.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/48607502677.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/lopibamabotofugelakel.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/zemotivozom.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/lmhg616bjekjrelq1t0ctkough/38119898787.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/36310963796.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/4926413152.pdfIn PDF document text
    • http://cecev.com/stockages/files/86263942667.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/pivalidokisulopijonu.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/26296675563.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/virewapililezonib.pdfIn PDF document text
    • http://ccsl.asia/files/mefusigijuz.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/kudazitewokimesesu.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/zukefatisek.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/kanedefedore.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/rupemitedowojakerodes.pdfIn PDF document text
    • http://fygl.net/uploads/file/100322596430.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/69799049380.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/86654242321.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/6117217848.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/rirojales.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/pujufefuxezetamabidozukam.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/pawazepidodubut.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/22492098086.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB853 18864 bytes
SHA-256: 757f0e9956062cb543045c7cd1a5795dde085c134f2ca90bf6fa8aa6c82382b9

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