Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7c5670d7f31109…

MALICIOUS

PDF

71.0 KB Created: 2021-10-08 10:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a5bb5f5124397b783e821c1fc3e13ae3 SHA-1: ad4d870f1e893fcd3e6ae234cca9dc6d26aa9f2e SHA-256: 9a7c5670d7f31109bb5d4d06d0c18cf5621ff1df7d1a0081ec2fc244f6246d88
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 embedded URLs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs point towards a phishing or malware distribution attempt, likely using embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://studiogiovannone.com/userfiles/files/19352021532.pdf In PDF document text
    • https://parisnordmedical.fr/docs/file/kajazajoxezanegetana.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/96189829149.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/kozenutepivubazisumolepef.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/mokotofola.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/walasivefafamiwokiti.pdfIn PDF document text
    • http://gdgom.com/upload/file/210905202223663140j1710e6ggm7j.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/nuzixe.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/55571821288.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/31597517731.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/fefeliwudowunijojubixufi.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/79651156190.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/99672363146.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615bd9cf634b1---61156156779.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/43588563283.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/45911039927.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/87168926816.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/kudigepiboku.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/jh2s9lrkje48evjhjpsqojopa3/jewizapobozalakoguv.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/61290055529.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/1600724705.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/pivebemixirosadak.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/zuvipaxa.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/7659341303.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/vofoveg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=example+of+a+bill+of+sale+for+a+vehiclePDF 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_off0000b60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60B 15444 bytes
SHA-256: fc20f9f5a4dcf82649597ee3fee299c40720688af32a52c3d56f34d4558f5770
font_01_sfnt_off0000dd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 10836 bytes
SHA-256: 19b6eb72a6ed498cc06d69b539cdacecfcca456ff0f3a000fc903f18f14c66bf
font_02_sfnt_off0000f615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1