Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b65470ea250ac2…

MALICIOUS

PDF

69.2 KB Created: 2021-10-03 01:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3246c12e2adb94f3b7e6af6e18811118 SHA-1: a470c1d2617562f3fbafc6241796b5eb3d34ebda SHA-256: 40b65470ea250ac282ca93fa2e3d6e878c56555b9fbfde105c6bcfc5e560eeee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing attempt. It contains numerous external links, many pointing to unknown domains, suggesting it's part of a link farm designed to redirect users to malicious content. No scripts were extracted, but the PDF structure and heuristics point towards a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ehlibeytalimleri.com/resimler/files/66578930987.pdf In PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613fab4d52e9e---47979601959.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/kugoxopexixinavutitokataz.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-22/20210922222529808974.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/60130843385.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/86047178581.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/77487622082.pdfIn PDF document text
    • https://mar3ol.com/Files/files/53807687164.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/fixebep.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/vasodoxegilufis.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/18753931378.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/repejogosavotevelalatafu.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/mulodakakasebov.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/jigigufurebokej.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/45654552768.pdfIn PDF document text
    • https://sim2007.com/files/53094777011.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/83396902084.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/18482553399.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/30910632353.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109251654407358.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/loputodareriwupagetakub.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/mumavaminorijaxumas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=small+tibia+fracturePDF 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_off0000adbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D4 10420 bytes
SHA-256: 4230808dd82d777f5c85076cb25ab1f181c6bc2ccbb2e235f07ed5f8bc3be9b4
font_02_sfnt_off0000dd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD77 16804 bytes
SHA-256: c688a7a34e61897f8a03bb03e718c41c38bbd93b05948573262e635284dc1c2d

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