Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9599b386d3e2df…

MALICIOUS

PDF

87.4 KB Created: 2021-09-19 20:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 87d8cc589adf0ed3fe00c50055b347ae SHA-1: a28754efeae0d8721d44cf2a64496b540503b220 SHA-256: ee9599b386d3e2df012125721de0b251ee1af4f0ff85d2a5e046bfc722937aa2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable hosting. 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 executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://adhunikjewellers.com/ckfinder/userfiles/files/lefipowujamaf.pdf In PDF document text
    • http://vinaaquachem.com/uploads/files/kowumigopajexisu.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210915151223.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/11082891036.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/30151905893.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/tifofin.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/nugenigexujit.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jutipenutek.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161350929891d1---97494977559.pdfIn PDF document text
    • http://billsky.ee/files/file/rilalimurebejag.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/26219633202.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/mabowodawumafi.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/50003183907.pdfIn PDF document text
    • http://analhospital.net/file/files/fapekavawa.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/4409183221.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/32715174009.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/26744796289.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161339b7bbdd94---50866569312.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/tuwewutatud.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/90108210113.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/9353950596.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/tugugenem.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/37331642278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mass+effect+andromeda+characters+uglyPDF 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_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 18608 bytes
SHA-256: 4b1a4e6118e236785bb68243fc39779d73169e3e9ed72d0685934af3989ca5a6
font_01_sfnt_off00011e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13630 11036 bytes
SHA-256: 5319684c3b34af10d2084540a1db8ec72eaad395ca541d77812d14713868d325

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