Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f3efefd032daad…

MALICIOUS

PDF

79.3 KB Created: 2021-09-08 15:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d1b79e0859c898fdb721426489e81fb SHA-1: 0ac182a0417a206a8b57edc21be31d0637b357de SHA-256: a3f3efefd032daad756df16f7aac5efaea981034d69a0c79fdc1813ac6e68329
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, with high confidence. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF format itself often implies JavaScript execution for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xn--80aesyq.xn--p1acf/files/file/rarizogib.pdf In PDF document text
    • https://springkasteelhuren.be/userfiles/file/77288596371.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/luxevewefo.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/61562733653.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161385e960398e---tagejafominuberero.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210906_6F1AF0BCF564E33E.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/1751558329.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210902071831.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sixav.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/vifipuvu.pdfIn PDF document text
    • https://upaspor.com/resimler/files/piserono.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/jepezonadebajisesuwujobaj.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/fifajomifezoz.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/81645116176.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1656b7c30a6c1fd33e0420153870e8a6/10803743310.pdfIn PDF document text
    • http://vejwun.cz/images/77488149998.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/12963746699.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/nilekamobokunonod.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/pofisagogosizoxikanud.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/fosevegigemebebasapos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=domain+and+range+worksheet+secondary+2PDF 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_off0000ce58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 18428 bytes
SHA-256: ca29b433308198286af81e871f4d1f047a2c7cb622769d4a4b7d518214409e8b
font_02_sfnt_off0001162a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162A 11184 bytes
SHA-256: 6d64238ef2fd3854ac74f84d9fa2cbbd37df0dcc565fdd848adf765508a544cc

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