Malicious PDF — malware analysis report

Static analysis result for SHA-256 812b7441eb9cb33f…

MALICIOUS

PDF

81.5 KB Created: 2021-10-04 12:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b92207e5aad0875a7b7e549cbe3b3448 SHA-1: cc9e52ce0df1cef3c85b3bc96c04fcf1b079a124 SHA-256: 812b7441eb9cb33f64686ab404e2a190fa94c5f0bfb1ab0030e949ef57590f2e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The presence of numerous embedded URLs pointing to various PDF files suggests a link farm designed to distribute further malicious content or engage in phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.sesc-am.com.br/Selecao/ckfinder/files/32268043858.pdf In PDF document text
    • http://chickenwild.com/upload/contents/images/images/31208338995.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/56125903007.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/belofalodiwun.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/28793281278.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/58784059758.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/88042119786.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/46620048094.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/49574726538.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/vimetifibixut.pdfIn PDF document text
    • https://motecx.com/images/file/77902448276.pdfIn PDF document text
    • http://sayarbobinaj.com/file/49841152871.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/91155649357.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/61090518731.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/67916096131.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/zetogokofapuxajewelude.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/41076955504.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/43634853028.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/korememufu.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/67244769264.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/valuzenavaze.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/6746317783.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/84694680630.pdfIn PDF document text
    • http://eternaseguros.net/files/files/tufuxuseduxanegisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=really+hairy+chestPDF 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_off0000dc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 10260 bytes
SHA-256: fc25f80e394005db233fe236d2ada4e83f5785b6488383371ccdb3b6f8220a1f
font_02_sfnt_off00010b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5B 17676 bytes
SHA-256: 83d6241ed9e14c0e2e0fc8bdc4f550e8226fde1aa7e8d064cc3225b71bb08af0

Open this report in the interactive analyzer, or submit your own file for analysis.