Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88a95ea7635f028…

MALICIOUS

PDF

66.5 KB Created: 2021-09-29 14:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 726e0c792fd53449479348458936b11b SHA-1: 403796dfeee301b592b3a728c0316a8beee62864 SHA-256: a88a95ea7635f02898030c2ca5d62514b9fb8fccf32bb4a5b92f13d2e70e9517
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 T1059.007, and the overall nature of the file suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.8672

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://pixomot.ru/uplcv?utm_term=eve+online+android PDF link annotation
    • https://hondaotohaiphong.vn/upload/files/narolodojinefapuzemeku.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/kobawokidaluxupegulepo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/lcea22sqn9r6301husjrbeiedq/35551683055.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/99549791697.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/mivasuruziseniwilik.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/72052917213.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/39582264622.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/60720954741.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/loxotivetavuporuje.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210914100550.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/99550201115.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/47305558906.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/gifejitobomexaxubuv.pdfIn PDF document text
    • http://ccshecea.org/upload/files/75485045560.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/wobopodatukup.pdfIn PDF document text
    • http://sro52.ru/uploads/files/jewusizuvosabanigopiletab.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/famewapatewevewonutuxas.pdfIn PDF document text
    • http://gr-chem.com/upload/files/61950366241.pdfIn PDF document text
    • http://ruresept.ru/files/file/68622965347.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/27157051367.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/xenoxaposut.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_off0000aef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF7 10024 bytes
SHA-256: b660751a19f268bd0d074231851878fbed237cf76cb184275d6504a22c5c8437
font_01_sfnt_off0000c53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53A 16712 bytes
SHA-256: 46231e488a4e68bf03f106b1847d0ff8fdb452d2cb1f9d2e077f894f6d85a28e
font_02_sfnt_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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