Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0c989ba131f060…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 20:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 22835e3e98095ea4e922b3eb8359fa05 SHA-1: 570c46bc063fd4fb22ac9cc34e4bcbc5ff3edde4 SHA-256: 9d0c989ba131f060f3e1b1f0922bfad42a885933435a7bf443874846abde55f9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on various domains, indicating a link farm. The ML classifier also flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection to these external resources, contributing to the overall malicious intent of distributing or hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2a5315d4b---64321944386.pdf In PDF document text
    • https://preprodpcb.com/userfiles/files/73382462244.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210917012607276.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/42877058663.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/makalazuvupo.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/69595463859.pdfIn PDF document text
    • https://alev.az/userfiles/file/zeguzesixawosuxokemavune.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/sixabiketirapolixux.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/rikuvuxasogotomu.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/33275109831.pdfIn PDF document text
    • http://sro52.ru/uploads/files/zirewokakilubiluri.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/1882801984.pdfIn PDF document text
    • http://ranchobg.com/img/file/53393458528.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/dofisafevesirisilajixopig.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/71081756542.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/vokise.pdfIn PDF document text
    • https://krusomying.com/data/file/nebige.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/62031140493.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/ruladaberovorutamajux.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/pamanufadezigowate.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/78669827764.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/kudobatapomemofumozo.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/mibupujur.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613500a5b4fb9---64977597687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pprn+games+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_off0000b21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21D 17688 bytes
SHA-256: 11dbc959de4bfce937f87ef797d5898216e0879903868bb4da14593ca73617bd
font_01_sfnt_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 10592 bytes
SHA-256: eb60c7f239c40d5650da772f09b38fd45354b5ed080aa33656b8a2e38fd958ce