Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a5e1f6f2731350…

MALICIOUS

PDF

72.2 KB Created: 2021-09-13 03:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: be09d6c05d825a8581f46a234388645b SHA-1: 6ee5645d1bb81d9bce05d4bfa1170db657846c59 SHA-256: 47a5e1f6f2731350ec23716613b91c59844f5984878689edeb80999e912e1330
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing campaign. The PDF contains an embedded JavaScript stream and a large number of disposable links hosted on various domains, indicating a link farm designed to obscure the final malicious destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://cosmik-kinoteatr.ru/sadm_files/sudugijopolidatataxoj.pdf In PDF document text
    • https://sindonis.com/userfiles/file/jofamuluxakutixuzezevexoj.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613042442b93b---64706971613.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/26486833030.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/tarumogitu.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/42762605023.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/tasojunixuwesefinoxadul.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/ridudafaxamov.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/xamixu.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/5860633761.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/monotatakevewejetamir.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/55631485550.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/5526919075.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/notizafosekiwujowusijox.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/48500466952.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/84069893608.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/15579151640.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/walijokisekunopuforam.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0753ce24f---jetozowawedavo.pdfIn PDF document text
    • http://synfarm.com/upload/files/69401737090.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/51458225293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+affair+123moviesPDF link annotation
    • 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_off0000b6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC5 10604 bytes
SHA-256: 6e0b1729c00469adcaf97c94ba8f395d03461ba239c0dbf1f9308b056e094b48
font_02_sfnt_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 17104 bytes
SHA-256: 12b5605c3e2ab84ca1222dbb2a08b1782a2b99ae33dba11aaa9ac21b8d098740

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