Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93349c7374ef412…

MALICIOUS

PDF

89.4 KB Created: 2021-09-12 23:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aea45466c67df74f4bced7e2e9babf82 SHA-1: 74f7c036bd461e59dfe117c6323b5602dd3afdc0 SHA-256: d93349c7374ef41260dbe2ff04b4520938c25fa4e9223aea096160c066b5de05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://biswasi.com/userfiles/files/vojikesa.pdf In PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/64244701061.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/kijadasakinijiviw.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/27631076297.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/97240278604.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/44289259049.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cacd5ad855---rikodimovukifoza.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/maregokeregugode.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/puxufepusox.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134fc5edcb53---10790866427.pdfIn PDF document text
    • http://keramann.ru/uploads/files/zoxagalefen.pdfIn PDF document text
    • http://starma.pl/files/file/rixamatudonuzu.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/gamuxasidatisasuj.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/gidusewumugupijegesi.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/jovuvadetikolek.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109090950395684.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/tiwuzidawi.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/7705902702.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/79273038212.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/73733763076.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/xukizelagukadinepi.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///bagobifivoraretaxupaz.pdfIn PDF document text
    • http://podushka.by/files/files/sogafal.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/96516045697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=samsung+s6+over+the+horizonPDF 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_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F30 18180 bytes
SHA-256: 640dc5ac28db3c2d27200966322b0d33a90cb26fc99683aba459d43b0bbe2bb3
font_02_sfnt_off00013ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED8 10980 bytes
SHA-256: e7d05cf47df4ee6fe42b8b730a100cddabd9716ef620e6f91f5e349356504d73

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