Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2aee0bbf705de5…

MALICIOUS

PDF

77.7 KB Created: 2021-09-10 17:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd4b4c7b5ba5d86bebfb0c8acf10ca4a SHA-1: 76fe2872f429b63aa233d6e3ca0127309b2b5042 SHA-256: fb2aee0bbf705de52f14795812fbcfdbb2d1c84a4fd2a138f61eda8ab926daf3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://lawrenceyezersky.com/userfiles/file/katizifisekoluru.pdf In PDF document text
    • http://artetendasud.it/userfiles/files/kodowekegas.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/noremitepenakotog.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/vozitugumada.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/32852644114.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210905055227.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/27769056043.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/93031632960.pdfIn PDF document text
    • https://grancom.by/upload/docs/dozojudu.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/bozodogejedav.pdfIn PDF document text
    • http://net-work.cz/data/file/jivujoxowiduxevedeweto.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/16048175495.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/fabagegasupodexufuzisago.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/fidabopamiref.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/7664702738.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/pomenosofaguwevewara.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613777b505c7c---nazisexow.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/zafula.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/90247524513.pdfIn PDF document text
    • http://aweibel.com/Photo/file/butosewakadurojamomebul.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/5bc4f20735ec9f5ee8c326e79b57b71c/72770061847.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/72209363517.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/38571284365.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/gekofuvoxogepiwawirujebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+keep+ram+free+in+android+phonePDF 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_off0000cc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1B 17244 bytes
SHA-256: be636b5cf8c688f56fc52f76bf2a87b8878d22fcc43356c1f0b44e54e1523b91
font_01_sfnt_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 10716 bytes
SHA-256: a38bae5c916fd50489edba20b3b6a965f87e5ec5deec39aa53ee722df1977dbd

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