Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7ed58cb7baf8d5…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 07:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f404891a96a77a5e4f19ad00a95cff98 SHA-1: 51c9c070f55486f65bd7da176d1c92d4159b4871 SHA-256: cb7ed58cb7baf8d5f65f7f0373f1a565eb13b4c97574224a040c73a811fefd15
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with many pointing to domains that appear to be part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution tactic. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript execution to achieve malicious goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dongbanja.com/userData/ebizro_board/file/kapawifosejoravujeruleri.pdf In PDF document text
    • http://dar-tom.pl/userfiles/file/pilutuxetakimizavumi.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/vupov.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/tojegipepu.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/62640003689.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/xofasot.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/feriris.pdfIn PDF document text
    • http://usmleworkout.com/files/file/65838165594.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/28035182588.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/fosikaxikamodolodasuxetux.pdfIn PDF document text
    • http://techbis.pl/files/file/nulikogala.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/wamivesasi.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144222d7a5c6---janoto.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135881e60df7---mirajal.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/89507652958.pdfIn PDF document text
    • https://gulamanis.com/contents/files/wemuwabop.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/73939951474.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/saretoxevodaz.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/20266912590.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/85995720460.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/dopukiletibagiduja.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090112211173499.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/93629697550.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/vevin.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/89770006702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mlive+global+apk+2021PDF 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_off0000cded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDED 10544 bytes
SHA-256: a71b660750a10c229d326457d03d0cfb2d8bf80b9d6e58d7c2ef1c14f1256fe9
font_01_sfnt_off0000e5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 17448 bytes
SHA-256: b47e7173373de4c10862d8984d579c299c7c7992334db04704c18454ff2effe2
font_02_sfnt_off00011359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1