Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1921299da3043e…

MALICIOUS

PDF

72.4 KB Created: 2021-09-19 10:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7eb0737395266cf13a30da1cf2954de1 SHA-1: a9df6c744e3db3399cc7770f9f36e960f6f21afb SHA-256: cd1921299da3043e31f902808f109223cc6baefd6538e5b5c11db6a1d6e06277
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript. The PDF contains a large number of external URLs, many of which are likely part of a link farm designed to obscure the true destination, suggesting a phishing or malware distribution scheme. The embedded JavaScript is likely responsible for initiating the malicious activity, such as redirecting the user to a malicious site or downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://e-baze.lv/images/site/file/96943177948.pdf In PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kakebafafivo.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/87916137853.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/dejadixazemapaxi.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/47267224928.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/55632502434.pdfIn PDF document text
    • http://dasbluemchen.com/1887732956.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/807105ba4f817a21c07bf82188cdef3c/tesabujob.pdfIn PDF document text
    • http://hnhappiness.com/d/files/15415153287.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/zirinutatuxofere.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/jogolobutabigadusom.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/dejuvudevizitakus.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/26167348632.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/63893699760.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/kadewugebexo.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/85896335825.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/wakizikov.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16134fbb990ba0---sufokowebebonegategu.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/48088000617.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/rigufavibebiti.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/83016975484.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/75417234765.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/boxemudabijos.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/zineniduvi.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/51679768434.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/defujegulujasivavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=shareall+app+download+apkPDF 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_off0000b9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E0 10384 bytes
SHA-256: b4f19b3efa4362d8ba46dd1b34c3e61bad5d52bea8c0b9a9a47700743482f74c
font_01_sfnt_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 16828 bytes
SHA-256: 64e9219c92534a5520fd3f3a8cbd76fc7a1a48acb42226a8acbb12e21f2c884e
font_02_sfnt_off0000fc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1