Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee92e5637e73945…

MALICIOUS

PDF

79.0 KB Created: 2021-10-08 17:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 75516a41bb519d1a47f0925f01183ea6 SHA-1: aebda0ea342a67fd995abcf29a3a0efa71025881 SHA-256: aee92e5637e73945fc51a33c54fe0a8d72cfbf541f2246a13af061fa994f9d59
124 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, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7801

Heuristics 4

  • 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
  • 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://commonlawhouse.in/userfiles/file/87856465566.pdf In PDF document text
    • http://scoutpate.de/userfiles/file/69918921393.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156afe8e3675---nabidojefofe.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16153354365d0a---godolitobajijodogumowog.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/pifemesabukopomunakeru.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/fotes.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/940189775.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/namezenobos.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/sotilorefinezodizazudaja.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/vobosekaxiforobox.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/vobuxugibadokusa.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/81832440254.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/lagune.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/97527141787.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/84029876602.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/zanilubamiwedokof.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/pebewoposowopajewafa.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/53292783089.pdfIn PDF document text
    • http://innotack.com/userfiles/file/77587435077.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/kiwibat.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/46333081693.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/20520134893.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/88482693092.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/65187332187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=epinephrine+is+released+byPDF link annotation
    • 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_off0000e06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 19168 bytes
SHA-256: cf4b0d7b12524f33823c72a874c2d2d6cfc653bdeec472ff398fe97450d9477d
font_01_sfnt_off0001113a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113A 10508 bytes
SHA-256: 7beef805f9f392b9c0070ce37675113d63a30a0e17b734df17700781d39c046a
font_02_sfnt_off000128c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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