Malicious PDF — malware analysis report

Static analysis result for SHA-256 64fb7a0095ce45ca…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 17:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7954c4bfba524f128a0c141bf1d3670d SHA-1: 316d8e727aa0def190d5b67ad6274573aa7df490 SHA-256: 64fb7a0095ce45ca1e3479eaf9d0f114adbc37fa73f320fd98b634c1e26de556
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to other PDF files hosted on various domains, indicating a link farm designed to distribute malicious content or phish users. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://zatuchlina.cz/upload/file/sozorafosivipuke.pdf In PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/fepefejorib.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/17954451647.pdfIn PDF document text
    • http://benrassam.com/uploads/files/4050955236.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/mewarorolimakekaw.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/85717886447.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/tebuzufeni.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/10788648999.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/nuxotifuveluxoruzoposonan.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/24830124587.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/84353682508.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/73441388453.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/voxaradutulutemetopixilox.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/37195839573.pdfIn PDF document text
    • http://fourfoods.com/images/files/rusipupatalale.pdfIn PDF document text
    • https://produse-zilan.ro/files/tefogipoxividozit.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/59178167381.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fce4a6e5d2---51703670440.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/24133580884.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/xawororemilene.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/54280158037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=unbowed+wangari+maathai+pdfPDF 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_off0000d66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66B 18168 bytes
SHA-256: 25ab5b2b25348f7c215d7b108b46f71a7c3cc2fae1229454564361e3148e34f4
font_01_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D12 10964 bytes
SHA-256: d29f77f61fb1cb4f08686a7ff79b4a79d92961623d3283155572ec75e95f308d

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