Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7749ab5822e8bf0…

MALICIOUS

PDF

80.7 KB Created: 2021-10-05 09:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 237d23504c153993ebf6e9975585642d SHA-1: 38ca7a3dffaa8df15f7a1158c6b158cc0ac3a0fa SHA-256: c7749ab5822e8bf06eba94d45326a48e8f28515fd345c7556acd371be14e5049
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a large number of embedded URLs, many of which point to disposable hosting or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=constructing+a+pedigree+answers
    • http://schodylux.pl/userfiles/file/18678927182.pdf
    • http://way-of-spirit.ru/upload/file/57750802981.pdf
    • https://funke.be/data/file/navonudupuxawe.pdf
    • https://gdaniec.com/upload/files/wojetuzadesosuwewu.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/a4218774b3d047bf65a69be410e29a77/vekuzadaw.pdf
    • http://autoachtercamper.nl/userfiles/file/98416408376.pdf
    • http://akvari-um.ru/userfiles/file/91635089460.pdf
    • http://geoodwierty.pl/files/file/78554810598.pdf
    • https://ayurmitra.com/files/file/vuwaliwaba.pdf
    • http://hndgyl.com/v15/Upload/file/2021981756338040.pdf
    • http://fsnmmaterials.com/UPFILE/userfiles/files/94644519049.pdf
    • https://begili.com/uploads/image/files/56846335452.pdf
    • https://metricgroup.it/uploads/file/nujedujubevuvovudamuwizal.pdf
    • http://vasset.bg/userfiles/file/32400021967.pdf
    • http://dolphinkorea.com/files/files/6305058383.pdf
    • http://mingmitrcoffee.com/user_img/files/58039367310.pdf
    • https://lacgl.org/upload/editor/file/96407386512.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446d68d6918---56988521453.pdf
    • http://espressobuilders.com/app/webroot/files/userfiles/files/20273256502.pdf
    • https://windfreeklima.com/upload/ckfinder/files/36478261223.pdf
    • https://palet-school.com/files/files/83987395448.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d56a.bin
1de13f3a25b9f1d3f8f83c35628347255706bd295c78acb2f9013d64f732eda7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 18052 bytes
font_01_sfnt_off00010406.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10406 16792 bytes
font_02_sfnt_off00011c1d.bin
92e2af5091312af5c50704a32c1fc9bf729c5eac46fe14cc42a3c1f91089a2b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1D 10860 bytes

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