Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4dd5d609a8ecf91…

MALICIOUS

PDF

71.9 KB Created: 2021-09-12 16:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4e35a49d0c4d035d1c9b5c27d4514e1 SHA-1: cc8cf6dd8b8fdfe15e4240da59b277a8936d5a7c SHA-256: f4dd5d609a8ecf912e2f6137df86574b60ebff794ac7f118a6dad60dd3b0ec8e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious domains. Although no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristic suggest the document is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5732

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=google+map+snapshot+android+example PDF link annotation
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/vogekodikupijafukiru.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/ralunirile.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/begusaj.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/bopumano.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/rigosajilozejinuzekisoj.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210910075051.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/10089939517.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/guzirabozudawomomozefelul.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/21301322260.pdfIn PDF document text
    • https://dcimx.com/files/37764189154.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/59269705951.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210910_234939.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/zunininodazuwalakizi.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/73022790452.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/tasadaxazurujilulufibu.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/6074913881.pdfIn PDF document text
    • https://podimercrm.com/img/files/sutopulelur.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/26084576972.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/resudelulewumupiwapu.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/25960074743.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/bonepizolodi.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/16161021854.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1612edb755a3fc---mefapiberigadojibewajox.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/wokuwigejavufokaw.pdfIn 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_off0000c5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 16432 bytes
SHA-256: de2022bd344bcb0037fb84c8f9a690dc08e8f4b428cc1625ab5f952403a7cded
font_02_sfnt_off00010840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 10980 bytes
SHA-256: d8391166ff3b2d7f40785feb81a07f925b0996b3480cd5108ad27be3d94f8c16

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