Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8c4f41e0338a77…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 20:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7fd3902198b724cb34c54792114a4cff SHA-1: 591eb62fca1e9b4bb5528be67d2199a4d7833a90 SHA-256: cc8c4f41e0338a77a030452be726305138e92ccc6661f005df2a20cd70bc0b52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URLs pointing to other PDF files, likely to obscure the true malicious intent or distribute further payloads. The 'wkhtmltopdf' authoring application suggests it may have been generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ceomit.com/fckupload/file/rofakakefimenimatoraf.pdf In PDF document text
    • http://regmac.net/userfiles/files/gofevojevorel.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/91624690574.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/kivunumekumu.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/kajokabezi.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/vibemezabofaletig.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/pubugumajejumikesax.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/13/file/20210913_005841_137.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/wifemubofemudubudutux.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/30318773499.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/12261964534.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/94251448466.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/nabamivol.pdfIn PDF document text
    • http://katachizu.com/img/news/files/pibofujumu.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/wodufog.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090506473649.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/mimolazagedutu.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/kanaberulabigala.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/jefuf.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/fowuxupipigepim.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210905_090501_1920.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d22d062fefe09dd3701c891c3398d8bb/zudukenonafudelomudo.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/47086776190.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/49039682342.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/74209169842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=real+unused+psn+codes+2020PDF 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_off0000b66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66B 16908 bytes
SHA-256: 9e57482c52c203dac51e19b3a8dbc93f16655ddee173ded7b934025585162778
font_01_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 10604 bytes
SHA-256: 94c1d094f87c029842c8ee3830fe35a8da9cd1f3417b0522994257c211e05b3e

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