Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a4d24acc22e238…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 07:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7cc000ddf002fb133be1632a6c949aaf SHA-1: 4b15926c56d0b77e8c573391cdc6e967ed7bfc75 SHA-256: a6a4d24acc22e23858f3f1fac30f410c7916fa2b23954314931ab4e84245de6a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.saletime.gr/admin/fckfiles/file/52942884228.pdf In PDF document text
    • http://abnig.friendship-match.com/upload/files/lexoga.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/55914792088.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/87248910225.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/48764388606.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/jalixigevutafugovidugu.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/daxuzif.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/mivamajajorasozo.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/wulum.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210905/file/16307836306987.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/ginopopigojanososarozur.pdfIn PDF document text
    • https://ka-base.no/images_students/files/kulotisa.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/liwunafamu.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/80591400853.pdfIn PDF document text
    • http://hidramaco.com/files/files/72662540724.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/newetigifufi.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/d3pg3f4kuj98rgnn2j9d1ddjo3/48084847537.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/82602968185.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/68299721453.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/53162141446.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/tudukudubejudofotivovukup.pdfIn PDF document text
    • http://grabnerestriche.at/lakavitikibaruvodukix.pdfIn PDF document text
    • http://szwygs.com/upload/nekemudolupuvawixefogavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=english+placement+test+printablePDF 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_off0000dbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 16704 bytes
SHA-256: 4ee20b4f27dc04ea37a1af4072d1653a81b2e59bfdf0a7f5a3e6925967e02401
font_02_sfnt_off00011e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E30 10824 bytes
SHA-256: 633a316520596c5ff84c8c4f930d8ab6fffb551cb2a9c71f27fcd0ae8b32adb5

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