Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd42c1bc786eefd8…

MALICIOUS

PDF

88.4 KB Created: 2021-09-17 09:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f9775f7fea2c906561d7893fe550bccb SHA-1: f86052fb3ce5a3336818fae8dfcf0a0e33ea2077 SHA-256: cd42c1bc786eefd8401ca9e8bdd3e46c53fc09fcaca0d57441e7e8f35d2b3e20
134 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 an embedded JavaScript stream and numerous external URIs pointing to disposable domains, characteristic of phishing or link-farming operations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to distribute links across many low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=slime+stunts+nickelodeon+kart+racers PDF link annotation
    • https://media-get.ru/userfiles/files/10662474572.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/4255192080.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/239041945.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/85030467167.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/bojerasaziloje.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/ragidujojolaveravubanuli.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/kirepipinabulemurixiv.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///2035874771.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/wowim.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/wixeba.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/2551632357.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613c061a56f09---58448038300.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/tugibofomiwefixumarowaki.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/wokatixak.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/44067408278.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/54296965359.pdfIn PDF document text
    • https://basisnomor.com/contents/files/73173293149.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/wivojozurid.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/kelosigolagudawutovifiga.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/9508445215.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/27780266355.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/bozezoma.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/pufesalavomujapiwikivoman.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_off0000f164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 18788 bytes
SHA-256: 0652d33bcd1b1ede36e68f2d7c7190603326ceaa623675dfa7f15d914848b5e3
font_02_sfnt_off00013af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF9 10796 bytes
SHA-256: a3bcdd37b0c47678e484b90cadb8caf6fd5eeac195a246e7d346c3672cd866d2

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