Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c97511e1ddf6bb…

MALICIOUS

PDF

75.9 KB Created: 2021-09-21 08:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3e12dce62498abbc22eb16e8466d40b0 SHA-1: ce74d3bb633fce0311c6b9be9b36cadf44d4c656 SHA-256: 27c97511e1ddf6bba2c10b06ba23b1d2df72979edd5d6ebba6546293b00e644e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, many of which are structured as link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF's purpose is to redirect users to a large number of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crysiq.ru/uplcv?utm_term=iclean+mod+apk PDF link annotation
    • http://dainichiji.com/upload_ckr/files/koropitamuzomezuvizixu.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/40097187253.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/64153604715.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/majexokolodebafoweli.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/26163754606.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/96152995019.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/linerubunuxija.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/sugosirozasune.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/98354015448.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/fisozesosux.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/73179525781.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/1891163831.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a05027685ad26e8b3ec35cd7061c8832/47200802022.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021991955252405.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///zakidu.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210913130604862017079jyd.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/nutapukiramegoraj.pdfIn PDF document text
    • https://campermagazine.tv/public/file/12028641625.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/zopaxeg.pdfIn PDF document text
    • https://blokhol.com/upload/files/44460319475.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210905232733.pdfIn PDF document text
    • http://cartopack.com/Images/file/22101172246.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/43374916547.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/tipefike.pdfIn PDF document text
    • 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_off0000c41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41A 10260 bytes
SHA-256: 1a3924b98e22f056b1544f1d0005755d6c3111e576d12b608ad98f08716adcff
font_01_sfnt_off0000db11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 18268 bytes
SHA-256: 070f1dc3469d155ed12488036268edd639b8adceecce4c6de2d7365cb2d2f6bd
font_02_sfnt_off00010a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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