Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea866771470addc5…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 20:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2fdbc5b7a97f7e9de01d7b9e21f3a2e3 SHA-1: 1ce6492dce9738310a293d57ca12dfc56e383807 SHA-256: ea866771470addc5a18d7c969b3e05463f465c035f4b58b2b53b47b8f1851bbc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to disposable hosting, suggests a link farm or phishing operation designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pixomot.ru/uplcv?utm_term=oxford+dictionary+offline+download+pdf PDF link annotation
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/tupotatamefudof.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/polewugezaxolomolidumalir.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/29331401860.pdfIn PDF document text
    • https://reha.bg/content/upload/file/30538447947.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/jewuv.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/58006642085.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/78589792726.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/vevapefojejojewunalefiz.pdfIn PDF document text
    • http://afslab.asia/upload/files/nibetivinagav.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/47629685544.pdfIn PDF document text
    • http://vtaky.sk/media/file/74424217456.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16133281050078---92129796480.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/47949256110.pdfIn PDF document text
    • http://hiniceshine.com/upload/65377141504.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/neloxonon.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/89022409839.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/ximomevugezezufuxuteja.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/65234274588.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/bekudofekuwefujiwav.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/pepawo.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c2593d7d866bc27c3ae98b5f62d7595b/gugiwirunifesef.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/84877845380.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/61683973253.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_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 10772 bytes
SHA-256: 23ee9e0915a8cf8fe91a8313885ed4e0714878e85f1234b61d50ec270333a56f
font_01_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 17224 bytes
SHA-256: 99edc6716bce9a02bf58954c8f5b7b4b5df8180b1ee30447e21d4a94b00e10df
font_02_sfnt_off00011d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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