Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3d3af0413853d9…

MALICIOUS

PDF

79.2 KB Created: 2021-10-11 16:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 748056d21ac96fd9967279cb9c47d97b SHA-1: 17ed07e453e0b57d758f5533d37905e1b792296d SHA-256: 8a3d3af0413853d9b37d789c9e2636dec2d0f52bd8fa83640f2209f8647bb19b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to PDF files on various domains, suggests a link farm designed to host malicious content or redirect users to phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://dezmaster.com/userfiles/file/mipedefakeg.pdf In PDF document text
    • http://retco.ge/ckfinder/userfiles/files/nagolexiwoni.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/52686318868.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/17278289634.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/99559335890.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142d52cd5b49---mixigujubivixuk.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/68059556138.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/tukoxejavipirosev.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/12641406682.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16156d1f3e7281---rakenokilipe.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/nonujes.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/tumawalazonesitixiw.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210921071718.pdfIn PDF document text
    • https://fuoriscena.eu/file/giwenaxaxobe.pdfIn PDF document text
    • http://centrons.com/uploaded/file/8023206761363f7940d6a.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/zigivasemimawesujeladaser.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/pefosurujo.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/84171045448.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/renavolivoxavefaxigiluz.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/81882699687.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/dazoge.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/65499300792.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/togef.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TSvcnjQ06Jg/uplcv?utm_term=hotel+reservation+form+wordPDF 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_off0000d0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 10656 bytes
SHA-256: 7322efcc36943811fe3d31ced98e093b9f721e937660df4f1d7a926aeb48fe99
font_02_sfnt_off00010129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 17956 bytes
SHA-256: 20d972c092bd361030ec624905c199b433301ce1b9d2899054370d5f2399a30c

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