Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb596fc5bc96a1d6…

MALICIOUS

PDF

72.6 KB Created: 2021-09-09 12:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 063ab7e83edb29be8a28727f302a84b2 SHA-1: 4b22a7d3470420b134b41bb55a21b13765017664 SHA-256: fb596fc5bc96a1d67d2333cee2ff21a24b3b78f05deb274e1d9b2bf2c7ce7bd9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, indicating the PDF is designed to redirect users to a large number of external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=basic+accounting+principles+pdf PDF link annotation
    • https://worldpigment.com/image/upload/File/tavojuzitaf.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/5025393947.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/wudabejulariwoxegefon.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/36319837959.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/cf71d5ba0b758a6f2ecaccd517bc23b3/86236288220.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/17697272193.pdfIn PDF document text
    • http://vswet.ru/f/83433060062.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/17406347977.pdfIn PDF document text
    • http://podarox.ru/public/files/sewitadazonuzikim.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/33099720908.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/xijelenogilin.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-7/20210907083720157697.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/bukakemode.pdfIn PDF document text
    • http://clingac.es/d/files/31831786243.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/juzisinesiduxor.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/86163411927.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/pofalisamawatudorile.pdfIn PDF document text
    • https://ptogel2.com/contents/files/zabobagotugemunazelatobef.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/92361833887.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/zikakuwifobususejufopil.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/tixesunarosikigokoxi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133adfb143a3---davomufenenibunutemota.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/dadatomujufirogutefib.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_off0000badd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADD 15916 bytes
SHA-256: 3720e43d35b39e712f1b96feeba9ed4a82da2200694f191a422c8447759486f8
font_01_sfnt_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 10948 bytes
SHA-256: c189acd314a69803228d33565d4b3c4291120024b27357d513f9fac2cb192b28

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