Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff03cf589af34934…

MALICIOUS

PDF

86.4 KB Created: 2021-09-12 15:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 066839645dc813cf6cf253ada1f8c88c SHA-1: 03c8ddc0944685cc44b3a34ff11a81b43ba61df5 SHA-256: ff03cf589af349347e8cff14f2ecec72c451c8e5b76723356b0c32abf8dc2e97
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of JavaScript points to T1059.007, and the nature of the file as a potential lure suggests T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://abwferrellpkwy.com/uploads/files/nuwezowolirijebowav.pdf In PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613524b9dc2a1---69439340826.pdfIn PDF document text
    • https://aaaxxion.info/images/file/19490341419.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/fakavovolezukotaw.pdfIn PDF document text
    • https://bnovum.hu/downloads/xapusoruvulakuxawirawima.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/wutetoboxapinipiwunuja.pdfIn PDF document text
    • http://dongphat.net/upload/files/siderufesobatogenit.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16135aaafd6d72---76113792812.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/4962929270.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/54788770985.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/59199286928.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/fibabedutupu.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/fojitesurifoza.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/3678935918.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/vasurunaxen.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109121820026291.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-6/20210906231644700553.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/76663366753.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/zofitovusotakosugez.pdfIn PDF document text
    • http://ukrfirework.com/images/file/vajusavikapowikadir.pdfIn PDF document text
    • https://alev.az/userfiles/file/47618573944.pdfIn PDF document text
    • http://mariancozma.com/_user/file/52918031831.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/55813205690.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/lomamewiravojolexadelazot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=google+file+manager+androidPDF 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_off0000eccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCD 10472 bytes
SHA-256: 1f6ca28e9d0f746f7ee833cb367be467f47bf6448059677659fd9556661ac478
font_01_sfnt_off00010451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C63 18392 bytes
SHA-256: cc3c6eabd4c9e596043e606f657c08be93cdf3bb457d261343e54fb1fd61de24