Malicious PDF — malware analysis report

Static analysis result for SHA-256 a999e9cf2c22ea5a…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 08:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8dbdb60188fb47e9b26bb373b15dbdc SHA-1: 6d572b2de7ee0b450c49eb8d85d67d8fdbe859c2 SHA-256: a999e9cf2c22ea5a10077782d9215ee66b25f74a8f6c1e460696dfb7d0412c2b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medvor.ru/uplcv?utm_term=nba+free+download+2k18 PDF link annotation
    • http://utcsp2.rustyramone.com/uploads/files/98982144506.pdfIn PDF document text
    • https://10fci.org/userfiles/file/lusakikom.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/zaguzagusom.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/33084431312.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/vuvafuwimute.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/nojowexinowenixujotote.pdfPDF link annotation
    • http://www.darvidproperty.com/news/file/vuvawejimabamijujoregufup.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/nulopa.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/judadozesesiwom.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631245580.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/vulizenasetupebevusev.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/xoxutoluwikunujox.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4733771cb0a2208463a2ecf67894b1d7/lolasetigotiroxuwamase.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/dutejamafiro.pdfIn PDF document text
    • http://leeandrewdavison.com/download/jamijovibabedalo.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/berafalanumefi.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/70893593222.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/83515609674.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161340d4ba62b2---88223300589.pdfIn PDF document text
    • https://rubfila.in/files/file/40504617000.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/24202418523.pdfIn PDF document text
    • https://pactforfamilies.org/ckfinder/userfiles/files/zanusamepoxa.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/dovitatizobixake.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/gisoxubumewaguvafuzif.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_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 18560 bytes
SHA-256: 6c0b6b1cc6fda731f16bfbd3befcde5929890d4b71fd3b16220c41afbe340047
font_01_sfnt_off00011768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7F 10664 bytes
SHA-256: 143ec778749b0543bfdf7a08963c8b128029990c3e473a244ae7402188e58d19