Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3c11297f1d3f9a…

MALICIOUS

PDF

80.7 KB Created: 2021-10-10 21:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 43fc7213a050434032ad285d318b9cb8 SHA-1: 987e9a9fe199dd8f40860c11b37ddfdf652d938a SHA-256: 3f3c11297f1d3f9a65a5c1fc135f3d68614fec1d70821eddb4db2360d8532501
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute links. While no scripts were directly extracted, the nature of the embedded links and the ML classifier's high confidence indicate a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=silver+going+black PDF link annotation
    • http://immobilieninvestors.com/userfiles/file/lamodubade.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/nozatokib.pdfIn PDF document text
    • http://retrofotr.cz/files/file/zifagefofotixujiburugin.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/67586494700.pdfIn PDF document text
    • https://istanajp2.com/contents/files/22802597184.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/pumulo.pdfIn PDF document text
    • http://dr-temt.ru/images/file/tofifesurimo.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/zuvotowenibadatazimini.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/duwof.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16158ae7a31adc---21995337773.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/rejunovubowovor.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/95499330543.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/femafunenosofokizadupezep.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/divofeveda.pdfIn PDF document text
    • http://01host.ru/userfiles/files/52145842010.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/99373905829.pdfIn PDF document text
    • http://twilaw.com/files/files/15396887217.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/17577267666.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/rinetidata.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/xerafowuluxaji.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/busotisasilom.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/33391093105.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/janir.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/befozuzisuxajirasa.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_off0000da87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 10512 bytes
SHA-256: 2767a7836d49a7cedd5e914609448bc7e98e12f83e13485fabf752111f7a9ac0
font_01_sfnt_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 16680 bytes
SHA-256: cab8330189c64399e88c33fd9a77917887e00cdf52f3fd5306218304567d9e25
font_02_sfnt_off00011d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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