Malicious PDF — malware analysis report

Static analysis result for SHA-256 217249b4e1d588b3…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 05:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a4c39b3813b65e227b8a0ddd6ecd651e SHA-1: 61c788350e14340bb9611b1ef4d833d44473e134 SHA-256: 217249b4e1d588b38b5aa0e7a26e8fc73b147d9cbb082445b6f2ad1cd5c41c53
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting an attempt to distribute malware or phish for credentials. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=spider+man+3+psp+iso PDF link annotation
    • https://mahae.hu/files/files/93636061504.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/golomuxonasewaloge.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/72205231190.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/98571249965.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161412ba6ac920---zogebawilurezudani.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210913061931104238v3bst5.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/soxavoseke.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/bajajadiji.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/10988378264.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/visur.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/jumetarirejarusesazalo.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16137ad01d9799---72445622225.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/22878771567.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/2020797628.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/15692217637.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/vijezasibakanapadiref.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/surimobegopuwida.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/bizoporowemafidutuzup.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///kiruxupi.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/xanebotaloxe.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/4718849210.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/betakapemunoguxod.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/xusiretosanomepobapi.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/razinavumosewalikumugoj.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/jerawagefiwitivux.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_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 17428 bytes
SHA-256: aa4844ccf7a8ba025ec053a07aeaccb11be794f7665c26d13909ccade6829ee1
font_02_sfnt_off00011ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA3 10656 bytes
SHA-256: 29bfa829c5587f60c37c5fcd292081250e9d62dd467c5ec5f22114afd343e816