Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d770e72d32d335…

MALICIOUS

PDF

74.0 KB Created: 2021-09-24 21:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 49cf0ed80dece745551bfa0882a5da1d SHA-1: d0ffa1b632d244cd575762faa0652b099242ef51 SHA-256: a6d770e72d32d335d30f6267dd3d007ea555762cf1b5fe068b59f67e42805b0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is likely part of a link farm strategy, potentially for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://newtrichur.com/userfiles/file/lafikowojebalikolofuvo.pdf In PDF document text
    • http://cuuhoatudong.com/upload/files/18997910486.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/wupesusikowowuvidiw.pdfIn PDF document text
    • http://podarox.ru/public/files/40105269563.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/xenirofopufu.pdfIn PDF document text
    • http://www.puhito.hu/uploads/zasawumumofave.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/34786487045.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///22262565019.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5d6b00d1---19811702833.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/26354231386.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc70d0f76c---xiruduwedotebufotal.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/gixariwilexegezaxiwalal.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/55395054582.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/74258566590.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/zenulafubegez.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/79489066945.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/woxinososuzumafutovuxoba.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/70154540249.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/vujeridewoxelam.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/zurovividexatu.pdfIn PDF document text
    • http://elsped.hu/files/file/bexapetuvagubadixuwolu.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/16521921130.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/880984046.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/gogisajuvopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=viva+video+editorPDF 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_off0000bab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB1 19264 bytes
SHA-256: 75d6b75ccb9d5eaa67bb81c9bc0f7bbcd42b7ca25eef8b51316d1da2d451b7ca
font_01_sfnt_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 9956 bytes
SHA-256: 69b645c850ad160b49b4a3203e9253845d85319e030180a2d93e7036f828aabb
font_02_sfnt_off0001027b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1