Malicious PDF — malware analysis report

Static analysis result for SHA-256 e482bc5315f4d002…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 14:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24c6e337ff489895cb2db71a04a9023e SHA-1: c502870f35b8606d31ce5b6eea833fa0d0c2c538 SHA-256: e482bc5315f4d002cc5c2f545905f69d4e60f045b4ce8538b81538d937db870a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through the linked sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://catamma.ru/uplcv?utm_term=justin+martyr+dialogue+with+trypho+pdf PDF link annotation
    • http://namlinhchivietnam.net/userfiles/image/file/28600817831.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420d2aca116---lorur.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109181931476416.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/dumudonuvi.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/27253389252.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/39416819933.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/lamapojidilevomakatufepof.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/kijidafelifu.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/xidewubupexazete.pdfIn PDF document text
    • http://dnepropress.net/files/file/90742472283.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/78819233451.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/merut.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/xibajugumipiv.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/lerinojol.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/dixazojexukoduvun.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16142cf4be22c1---foloxepakisor.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/vijikomusumiti.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/60917344229.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/susazapawe.pdfIn PDF document text
    • http://agavietnam.com/img/files/1492687437.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/tajiv.pdfIn PDF document text
    • https://le27.fr/docs/file/45059245670.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/47802879922.pdfIn PDF document text
    • 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_off0000d859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD859 11236 bytes
SHA-256: 5a4b2c3b955807088985d4d5fc401b6e68c3adf5baf0ae6286f0b0b63926dccd
font_01_sfnt_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6B 18260 bytes
SHA-256: 73ee6c4d8a2ff6bb1b02805f656a28a97005c9e28a400d547ee73a5915807fa4

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