Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dc5be07b77e971a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 09:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c553b691b1b060940e56ba46513ad4b2 SHA-1: 574ad2ef30f2a3ceb8252d5847c359c9110ae268 SHA-256: 2dc5be07b77e971aacd12872753493575e6918773544ba7f380767f719b82c72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are part of a link farm on disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious websites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://synerhu.ru/uplcv?utm_term=james+and+the+giant+peach+free+pdf PDF link annotation
    • https://kalitelivideoizle.com/resimler/files/8885848474.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/mejitakomasijogobobexige.pdfIn PDF document text
    • http://skia22.ru/pic/file/gorakabomizi.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/69768109842.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/87099665650.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/86706524585.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210911220158.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/felaxuzojosekap.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/99704847539.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/vubap.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/muwazutizuwabuwusax.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/zalazuxetamifa.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/ladowedivurekuwid.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/44580891345.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1415e8af5---lemaropimakerelidobadide.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/79790859296.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/579b8f91ccc35fa6f0a93947aab2341b/pajanozilixerusajevafu.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_off0000b3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A1 18080 bytes
SHA-256: be6fb8914703fefaeb59b7a988607966862fda11c35b9af0f7dd6e6157f26bbd
font_01_sfnt_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 10892 bytes
SHA-256: 0ee8e230b0b0b49f9d2d93a0eafd57a0e590783d290006284d100226df7c30a4

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