Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3df8ba2f1cb6c2b…

MALICIOUS

PDF

71.9 KB Created: 2021-09-29 11:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fc335ce869e1fe01043172e88a26a503 SHA-1: b0af8c190f90433df47168d6a44270bbfa016343 SHA-256: e3df8ba2f1cb6c2bbf39218558639483dbd8cf5c2c9aa17fda0af3fdb7d20998
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. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=hill+climb+racing+game+download+apk PDF link annotation
    • http://hlqh.net/userfiles/file/20210903210528_2038738389.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1632304109_2c7a509a4a.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/56060309266.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/3530987991.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f0de3d49e---wukukegurenawasenasebo.pdfIn PDF document text
    • http://goldmustang.com/files/files/funudurujina.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/dolofova.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/pubiwifotogabo.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/72905510490.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/penulut.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/280212025530.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/rutujalafosag.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/jukudofekazilabovodijudi.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/25015896028.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/rimonojowe.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/fibugelojagulo.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16153c6da6a6bc---xezoxolamepowujovejef.pdfIn PDF document text
    • http://net-marketing.hu/images/files/22128128581.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/83609719070.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/95673842409.pdfIn PDF document text
    • http://sdds.be/userfiles/file/gakitukelasijatadofujaki.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/gezep.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/77888845977.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/xefoxu.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090708335320.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_off0000b5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB7 10900 bytes
SHA-256: 2e1af07cc78b22bba303a30b142d6f985125e9372ed0e32dba2a0f74856910b8
font_02_sfnt_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 16944 bytes
SHA-256: 3e2a3211a3dad40e5f25658acebe21f09f9fad58ce314b02f3587bf63f68b6ba