Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffbc4be650f33edb…

MALICIOUS

PDF

74.3 KB Created: 2021-09-16 23:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 53a1d225df81b3b4ef5c73429a9ec30c SHA-1: d7466297fd65a29b49b25ceccc86b9fafce399b6 SHA-256: ffbc4be650f33edbef8fec9f1e59561274297fe92ff3c610c5f2134437138210
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 hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through the numerous links. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://philabc.ru/uplcv?utm_term=linear+layout+attributes PDF link annotation
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/11518529751.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/zitimidegulosegijopozemuk.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuposefiwatugudaxiw.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/wewigefivup.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/tuzabidewasixokaz.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/semeji.pdfIn PDF document text
    • http://vaynhe.com/upload/files/fawewasazef.pdfIn PDF document text
    • http://feg.vn/uploads/files/20844835648.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/vadaxebezusudatun.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613509446a408---15552210498.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/kirokezebusagilixebopax.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/modimadoladesukogakusifo.pdfIn PDF document text
    • http://dejede.com/userfiles/file/jedevarivezo.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/15780228926.pdfIn PDF document text
    • http://tfforming.ru/d/files/86799830287.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/19917737838.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/somakig.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/nakibaguvidab.pdfIn PDF document text
    • http://baove247.org/upload/files/9465742667.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/fimawagoluxokupituza.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/butekol.pdfIn PDF document text
    • http://labotinnghia.com/img/files/13951001935.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/pezusavepan.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132393233015---besabupuru.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_off0000c143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC143 10412 bytes
SHA-256: cb87b6f28e4288381dce1833aaf6e4888d06383c46dce7604f69f18db533fcc7
font_01_sfnt_off0000d8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 16568 bytes
SHA-256: ce9fe8a70c437662a83bad4602ead9355fd00b8f2005dd2d63a758591b44bec8
font_02_sfnt_off00010364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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