Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65b11fc3bfb7531…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 07:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c220258ee13067447865a8c6e14b9b09 SHA-1: 4012967fb9eb0d43c60489f3e513bd2985c9f33a SHA-256: e65b11fc3bfb753111966cc4c7f663bb8ca3b16a0a47d8927be4a655bedb3cdc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, suggesting an attempt to direct users to malicious or deceptive content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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
  • 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://voszveszprem.hu/_user/file/bakipazetibimetuke.pdf In PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/bevogitotoboluzopelekapuf.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3e9d989806f25fc2b67878d778361768/89373757659.pdfIn PDF document text
    • https://clinicscrm.com/img/files/furoxakupilifamoxupox.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/12739911867.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/69944199801.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/66695437968.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/90225129237.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/dowopilakoxitolagu.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/pukujubaligalipolidajax.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/68621770127.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/41714246327.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/jugixilowotax.pdfIn PDF document text
    • http://aurora-c.jp/files/files/53206996923.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/25332516497.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5fcb1b891---69861882714.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/gotojod.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/79087983571.pdfIn PDF document text
    • http://araratmebel.ru/img/file/37069375306.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/75552262126.pdfIn PDF document text
    • https://isosklo.cz/uploads/8741746091.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/84492037379.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/rakopupiluzofofan.pdfIn PDF document text
    • http://zae.me/datafiles/file/83205218796.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/lirizujit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mi+tv+stick+vs+mi+box+4k+comparisonPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/6849334192.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_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 18012 bytes
SHA-256: a123111f75757a6845b5add01f05cf727b2aec6e76a4302ea4e6699eea741eda
font_01_sfnt_off0001173a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173A 10828 bytes
SHA-256: c8044d2bf18b98e4c5f356d418df256c1fba853d878a7364c32b03dabf03d5f3
font_02_sfnt_off00013015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1