Malicious PDF — malware analysis report

Static analysis result for SHA-256 d003418f635903e6…

MALICIOUS

PDF

79.6 KB Created: 2021-09-21 07:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 04a776fd098e3b1c09454a5c43203a47 SHA-1: a38b8d7b81b25a14dab65eeb12060088be2e2f89 SHA-256: d003418f635903e669d87e5184349fb0c48b1601ee8fdb29058ef0b330fb7883
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm on disposable hosting, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=shadow+fight+2+titan+apk+mod PDF link annotation
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/tudaferolakojabowuzesu.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/bizefovosipotuninedegefo.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/52635803253.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109120624189963.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149158bd0317---73906849965.pdfIn PDF document text
    • http://lj-group.cn/upload/files/61921717557.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/lodamelilekobefu.pdfIn PDF document text
    • https://bor-diing.com/upload/files/28371854048.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/8522980426.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/54784474759.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/penuzuniwudud.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210916_BF783218F85FDDAD.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/miduxi.pdfIn PDF document text
    • http://wmsone.com/eimages/file/vewogevapopoxo.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/dubeguxonewexij.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/detirizanoxemajo.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/72969005911.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/15782849692.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/57828646269.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/rifuza.pdfIn PDF document text
    • http://dakmet.pl/upload/kunifotiboxurapis.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435b306e928---82930821094.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/pinewin.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/95279653459.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_off0000d23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA55 10872 bytes
SHA-256: c6982be42b62c09fbef89f36ec4fa2c2e654b6fa9b56e5c160473764cbcbfeaa
font_02_sfnt_off00010329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 17624 bytes
SHA-256: 2f7afa03743cf5fb452651d25cdc5c00578f52dbb038eec4c0b7c1389793e683