Malicious PDF — malware analysis report

Static analysis result for SHA-256 543e3f81759b0531…

MALICIOUS

PDF

95.7 KB Created: 2021-09-16 05:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 22303c0b3067cd38deaa07670d976200 SHA-1: 082854aace7998c41ea18bfce7b825277ff1fbba SHA-256: 543e3f81759b0531dd9bab21c9d26dc49285f36445853c1c46de94a37c05ddca
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed it functions as a link farm, containing 30 links across 22 distinct hosts, many of which are disposable. The embedded URLs, such as 'https://wastran.ru/uplcv?utm_term=tenses+exercises+for+class+6', are likely used to redirect users to phishing sites or download further malicious content. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3333

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://wastran.ru/uplcv?utm_term=tenses+exercises+for+class+6 PDF link annotation
    • https://suncables.co/images/file/lijiwokamirimikijumi.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/sakesomevotonudiva.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/sawaxerumuxoxu.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/87574111392.pdfIn PDF document text
    • http://santabruna.cl/upload/file/8058296436.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/48262162077.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/64902648073.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/batidajonolorewovebun.pdfIn PDF document text
    • https://morabia.fi/images/file/57556580298.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/22804702889.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/janeveluzikolif.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/31216406517.pdfIn PDF document text
    • https://electroagro.es/pub/files/9026564646.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/werelofirezirekus.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/ramufigatisewofugu.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/17810135407.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210908051133.pdfIn PDF document text
    • http://prompol.com/media/file/36681095824.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3968d9fae---54797124946.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/24013250990.pdfIn PDF document text
    • https://masihpt1.com/contents/files/kivemolijazesajo.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/28245427996.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_off000125e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFC 10464 bytes
SHA-256: 1949c132f77c7e2db518516a82005033d08f5061c7e64c1a736617fc840b965c

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