Malicious PDF — malware analysis report

Static analysis result for SHA-256 a830a0eafce206be…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 00:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d628dca223aa7aafc21679088ec59e09 SHA-1: 4a271f244ba5470d5d76403a87937f35784f0ef6 SHA-256: a830a0eafce206beaf73b338f779abc0c1e56353c5af13e2b1493c03f2620c6b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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.
  • 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://dewalt-naradi.cz/media/upload/editor/file/gonel.pdf In PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210924_268D0F5C6D35767B.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/rojefuvezigufozavep.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/71047389165.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/95079993084.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/beniv.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/zumizozatinileda.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/53630180943.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/suxorexilatimok.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/67278960649.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/zexuditib.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/wevuxo.pdfIn PDF document text
    • http://linza-market.ru/upload/files/pipateviji.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/fosowugazuverojer.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/53033203908.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613172bb07152---13321213025.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/42294989811.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/57071794839.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/63772375294.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/setelemol.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d3a38e50---10135011581.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/19171245841.pdfIn PDF document text
    • http://state-lithium.com/upload/files/7397347162.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/fidefoverare.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/ribazubigenatawojilizufew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=messenger+apps+download+for+android+mobilePDF 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_off0000aff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF1 14980 bytes
SHA-256: 50bc859354e2c10bd5423cdbf0e76d6d26e522b7e6e5ee0a4086dbe453562cde
font_01_sfnt_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 10964 bytes
SHA-256: debc6dcf6e33097f29654ddb06ff6552c1835e33e5ad5105165e6cb51ef228fd