Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81bcc4ed9a14a8b…

MALICIOUS

PDF

92.7 KB Created: 2021-09-21 00:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2712e73891ad9e728b3f4c720fa66544 SHA-1: d6c5f93cec072b05e4982c965a1273c91dea0b3d SHA-256: f81bcc4ed9a14a8b8e1daf37153167c64d74ba8ee0ab69e756ad01592b2eff5a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, which are often used in phishing campaigns to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613edcab11970---wisoz.pdf In PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/r8g5jp6sahs1edd8t64m20aue2/81606237193.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/mefurejimamanozukefuzizo.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/jidaxotolajuvizeve.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/89418222045.pdfIn PDF document text
    • https://uangraja.com/contents/files/bitegono.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/sekunonawefopolikijop.pdfIn PDF document text
    • http://olympusflights.com/files/files/fojimenuredoseter.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/tuwenivotag.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/87585412322.pdfIn PDF document text
    • http://foxadv.net/file/noxifagawenotofomadapu.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/87485367775.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/89019596258.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/nilanolugivu.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/gezubakuwonoxenodib.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/toxutabikawivu.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/puboramer.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/24672524056.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/34624100997.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/nodazodux.pdfIn PDF document text
    • http://presupuestos.pavysan-bigmat.es/ckfinder/userfiles/files/zelelinapuwelezefimoru.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/43025663852.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/83873853248.pdfIn PDF document text
    • http://domario.ru/userfiles/file/21938923525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=craft+paper+minecraftPDF 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_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 18600 bytes
SHA-256: 93abe5654c7bb1464ee26ad5b416d3d3b5a16d163b9409ab3c9959c6b0a3bfd3
font_01_sfnt_off0001360b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360B 10336 bytes
SHA-256: 4d0c7e2b2000971404eae4645426c2fc1a727aebe3eb7d93ace26b8d6e9ad5ba
font_02_sfnt_off00014d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1