Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f74a54c5294d223…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 01:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae9cbcd410a8a6787b48a1b1eda52a34 SHA-1: 17e9d5187c788239de671846f0d77107d48c5886 SHA-256: 9f74a54c5294d223b47d995acaada2bfbcbff5516792dd5039b1e5c25256f8ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=android+landing+page+design PDF link annotation
    • http://hanmih.com/userfiles/file/20210907222547.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/pitinujulirenuvirux.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/bajapisisa.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/pejivemorarutaji.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/54504105270.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/85386531249.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/fixapofiwote.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/11033241457.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/94719090583.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/54150452264.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/hksnbg77di0ad49jt57nnuug8s/54419063344.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/91963024756.pdfIn PDF document text
    • http://ndt-ultratech.com/files/7863478634.pdfIn PDF document text
    • https://jin-ji.com/upload/files/jifisubujozufoxunife.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/vimurujisimosonumiketelo.pdfIn PDF document text
    • http://mfahk.com/upload/files/bivamudaxonarigof.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/kegagutobanuz.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/komotalofizerejov.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/jatawa.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/31508739989.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/dikasezironubo.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/68730961704.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/lelowimiwuvisidajesodemu.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1329ae0744f02d7bc3ea5005a6f0c4e7/lefowuxi.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/bivemusafadotukanudawenu.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/mebigen.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_off0000e28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 17392 bytes
SHA-256: a0d73d71cfcc119851be1d7791603dc3dc04ed0c8a96cc611fe99820d16aa63d
font_02_sfnt_off000127d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D3 10452 bytes
SHA-256: 1fba7bc07775e55d56b5c621a61bd060d185b6327fb3e5ca5d5e653aa7ec1ec0