Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb52395dc51ac84…

MALICIOUS

PDF

91.1 KB Created: 2021-09-12 16:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0a322cb79f246a8b837a465c2524822 SHA-1: 957fc52667a49461852e60c9596f67c0b3571f4f SHA-256: cfb52395dc51ac84f6aaa2b71ce5113ffdc1150023f73dd1510669f33ad420d6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external URIs, coupled with a critical ClamAV detection and ML classifier flagging, strongly indicates malicious intent. The PDF appears to be a link farm designed to redirect users to potentially malicious content, as evidenced by the numerous unknown reputation URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://sangtaoad.com/uploads/userfiles/file/jivano.pdf In PDF document text
    • http://carnow.jp/js/upload/files/63339096283.pdfIn PDF document text
    • https://norservis.com/files/files/gadaxelikujivatenawoz.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210907211624416914ukctww.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/zopamukej.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021090506095173499.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ccf616d2f---60246961078.pdfIn PDF document text
    • http://zgic.ru/!upload/files/56978408664.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/95867977301.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/63851420699.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/wamonimezudiputefedimex.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/dokabugitep.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b41136dd0b---70919253901.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/1526805507.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/21607767369.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/wapogaxisujaw.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/jemab.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/posuponuxe.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/97043045796.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/gikifudanawunutusadakena.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/72639674864.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/fekakomi.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/nuzumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+draw+a+3d+hole+optical+illusionPDF 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_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 19604 bytes
SHA-256: 6aea5582f4af309060aabb91fd177cfd8b40fc86ed260d72dca50dfea5612698
font_01_sfnt_off00012dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14601 10960 bytes
SHA-256: 767703d72b4a83084a83e68402f9a0e6d1b2430801f34d9f939de209310814be

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