Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59238ff720d3bd1…

MALICIOUS

PDF

76.6 KB Created: 2021-09-19 13:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a95bcb5163f8a0e85e1269185b2b334 SHA-1: 2f6c47b109ae77004733ca8abfbb900042871781 SHA-256: e59238ff720d3bd1b10d2eb2ba5083d1a69c675f5ccebcd03923a0370276a57b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to distribute malicious content or conduct phishing attacks. The PDF's structure and the presence of numerous external URIs strongly indicate its use as a lure to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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
  • 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://medvor.ru/uplcv?utm_term=radius+of+semicircle+formula PDF link annotation
    • http://restavratorstvo.com/ckfinder/userfiles/files/buxoli.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/56d0ad3387b3f2379f3323b9bd3c3ba5.pdfIn PDF document text
    • https://almavilag.hu/files/files/96500994763.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/goxezasawijawepatipif.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/18237609587.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2381a89c8---refinuvepazimu.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/82864732081.pdfIn PDF document text
    • http://suurelepa.ee/data/file/65734356393.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/20233282331.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130a287c1dfe---86510778649.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/13555757165.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/73857443108.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/lalikarawalapo.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/37146794918.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/gepov.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/19429570374.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/gosavijatu.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/63484378297.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109061318176397.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/wifuvimasabijekupukuxojo.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/74448006017.pdfIn PDF document text
    • http://gysanya.com/upload/file/2109032342421198914zl9ue9xdxiy.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/73154192728.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/16717065444.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_off0000c2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E4 10580 bytes
SHA-256: 7e046f315be986bae6497bf3675e8738187d810637f7c82dc7b857dcb6a95c7a
font_01_sfnt_off0000db0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 18868 bytes
SHA-256: 79a6ca7b8674053371b403124e0e7e017ca4e49a25c71266831b051cc316e45d