Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9eabacdafc5099…

MALICIOUS

PDF

80.6 KB Created: 2021-09-22 17:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e3d3abe5bf36a966f8124ea21b5f2fa SHA-1: 1247401b4e83296e0bf3dbb3ada4b867fd44545a SHA-256: bf9eabacdafc509994845aced72213ad20401b7231a5387bbe437b7469d00dd4
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=1000+square+feet+house+3d+plans PDF link annotation
    • https://ckmusicdesign.nl/userfiles/file/xukuwigelivijapi.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/64639705781.pdfIn PDF document text
    • http://holzbau-napetschnig.at/31970677174.pdfIn PDF document text
    • https://tessuno.com/upload/files/613690a48362e.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efcc0125bd---15376238471.pdfIn PDF document text
    • https://12shio3.com/contents/files/9681999528.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/zijimitunisovif.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445e5284292---fisorase.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/porivesidajuguwo.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/lusipopipatuburito.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/10664639467.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/wabopuzolotokulitatofuwaf.pdfIn PDF document text
    • http://vhshf.de/File/zogemarukaduvimoz.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/nifagufiserep.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/bejegerevubeferivenomeg.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///gitewabuve.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/mujatuzotozezosixate.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/53686866052.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210916_671A7FDB2C4C0EE0.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/58319312722.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/26519385432.pdfIn PDF document text
    • http://gabortech.com/admin/file/90281087660.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/sekanoge.pdfIn PDF document text
    • http://telektrans.hu/editor_up/jepototiwipotemudo.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/sobujefole.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_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 10996 bytes
SHA-256: cf8ac5a17502ba06dc3e398b36af24bc9965bb9f0586c424b692b87a82276071
font_01_sfnt_off0000eea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 17732 bytes
SHA-256: 80b5a91bfa454abeebce198e240ceec18dd990754607b46f8d21f2df0c7bca42
font_02_sfnt_off00011c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1