Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23bf8209bd8bf4a…

MALICIOUS

PDF

74.4 KB Created: 2021-09-09 11:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c20cd098e94f7fe420e83bf457d8903a SHA-1: 36a6942683ca8c19970d5b1dacd34d2d95b80b5c SHA-256: a23bf8209bd8bf4ae89d0d657175742874a95c9e3ff2a5759e54c03f5963a34f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the 'disposable link farm' heuristic indicate a pattern of directing users to potentially malicious content, likely for phishing or malware distribution.

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://ecodiagnost.com/ckfinder/userfiles/files/tokene.pdf In PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/10395977346.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/11631139527.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/xononevupimetatevu.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/88776298099.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/runuzuxuvezur.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/bavufuxilojarizis.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/25373539805.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/95336259456.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/h43pn24hh6j552i656k9jmuosi/39132354343.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/xamanatenedazepo.pdfIn PDF document text
    • http://espokebar.com/uploads/files/71588746707.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/76185123237.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/72641998969.pdfIn PDF document text
    • https://bawauang.com/contents/files/83175259081.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/zivaxajudo.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/tinudewalesaramufu.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021090204460073499.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/83912019188.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/rinojodowotuj.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fe06edb0f2da30f1c52786c0ba59adc0/58880680238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=spider+man+2002+gomoviesPDF 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_off0000bdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD6 17676 bytes
SHA-256: 47e7acd28207d6b047af82f75c2b7ed3ed3d2f0d1db9c55ace576fe705fe07bd
font_01_sfnt_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 10972 bytes
SHA-256: c53df88147cb10c19fa27cbece2b314e1adf158e01f82eb37597b349bc50adf3
font_02_sfnt_off00010422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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