Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b47ea4ea687188…

MALICIOUS

PDF

72.1 KB Created: 2021-09-15 16:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 60f2518f977dc8aa139f2092c0bd53f9 SHA-1: 41933902a9092d3c69eb0238d1e4e0997f8b163c SHA-256: e8b47ea4ea687188acf3c54d8ff6cfdb723f5e2e042d5514426ab406a62d2d20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm of 30 URLs across 23 distinct domains, many of which are disposable, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing lure designed to redirect users to malicious content.

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 http://nhuaduongnhapkhauaz.info/upload/files/fadabuf.pdf In PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/fegomuvubawobujujefiputab.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/vobeluligibaf.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350a0d28e01---56954733761.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/41373909722.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/98498499106.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/lunevefuwomusefafu.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/levumijopat.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/32920368102.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/sirarizugovoledefef.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/50069203443.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/mifetawuzirularoboxejit.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/28677966580.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/dilofavemutuja.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/pubanijowokitalazok.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/buluxelixusafoduxi.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/2746297390.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/2025694173.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/zofuvalebofufono.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/82785836188.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/21726736359.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/9674900805.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/42547962630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+uc+mini+handler+apkPDF 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_off0000b945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15C 10792 bytes
SHA-256: ff6c0acb77fac8d0e7ecb902828b52229179e13a441d5e03e23410a813a0c36d
font_02_sfnt_off0000e9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F9 16096 bytes
SHA-256: edf9ca025868b12c65a994e9c0d10cdbd6e4561ffeacb77eca009f769f066953