Malicious PDF — malware analysis report

Static analysis result for SHA-256 c905e15b8ea79ef8…

MALICIOUS

PDF

166.6 KB Created: 2021-09-20 09:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 21b3a7b8a93ef11ca18d6eacb71ec06c SHA-1: 98d14f11b7979bfaf0e3b0d51f5ef98a5a93840e SHA-256: c905e15b8ea79ef8260629b7be8e6b7eeb126d8d9f40c9325aac3803e51b5e6a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URIs pointing to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using many distinct, disposable hosts to obscure the true malicious intent. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to external content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7887

Heuristics 4

  • 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.
  • 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://laborke.ru/uplcv?utm_term=all+of+me+john+legend+tab PDF link annotation
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/e233cupi04si900aj2qtkeus68/kogejinukeruxug.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/vamosomexivedimuv.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109191710595701.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/68666933589.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/pegarogujewi.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/xelujatuwuvegimixejan.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/jevej.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/52230049698.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/60767485356.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16132d4ceba6be---12381082302.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/6810221026.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/63894748149.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/bigizupil.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/liwaliwakutow.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/tikafu.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/xafikanolorezikebimirakof.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/131904497796.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/liwasos.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/13478457055.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/mawaza.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/folavosodasakufezebam.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/76649639441.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/bagopejusaxurevigo.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/zotowejodufamitufalafavom.pdfIn 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_off000241b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x241B1 1696 bytes
SHA-256: c061ea5a1b35fc292d6b8b2091aa632fa0cbb9fad6333be4b33656a2cb7708f0
font_01_sfnt_off000249c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x249C3 10692 bytes
SHA-256: 2dcccb7a21e5ca5327769aa5004f50ddc95648c9189e544ddaf50ca3290af8bf
font_02_sfnt_off000261e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x261E5 20708 bytes
SHA-256: 8ab1bf86c0bcb2975adca9c063a30b96a8349645229030b34f6c37b1500e9123

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