Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbecf49927df85c…

MALICIOUS

PDF

62.5 KB Created: 2021-10-06 15:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: af20731a9c225301d28577cc04b4b9db SHA-1: cbeaaba27f85118656e51b40df70226e2b0e917e SHA-256: bdbecf49927df85cc2a3edfa9e9faa8f18fcff0958d0fb2a7be28965a10549fc
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use as a delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9433

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://queure.ru/uplcv?utm_term=the+universal+history+of+numbers+pdf PDF link annotation
    • http://lnianemarzenie.pl/userfiles/file/regopepomatomukugetegok.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396b8ea1a1d---fujofasamanamibimorib.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/34957663125.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/nibumedaxizololoxoxu.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/60560367139.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/62883594285.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/54051709515.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/9131961743.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/41163982244.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/78334693482.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/fowifadotovegurukofobosus.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/bigezadupogut.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/merunuwa.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/26626000852.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/dejezixitowofilivunego.pdfIn PDF document text
    • https://aaaxxion.info/images/file/merutejekevaxasi.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/deloworenoterenopurud.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109231232498062.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615402f9d80af---gutetawifemabekonojobojox.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/nigixeb.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/61553975085.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/58217979608.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E6 15744 bytes
SHA-256: f5e08b02e4e8a96215d99af679da3407829600f5d05610f285f37e15d2b3a535

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