Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34f0f0c6c33e24b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 19:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee77c18d677459030d268cc054cd7776 SHA-1: 1d48c8e29bbeb89bd12503f53189cf6e805091d5 SHA-256: f34f0f0c6c33e24bcfad96cbd134f82230e53a5a403e890749cc084f51a7c695
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to a link farm, suggesting it's designed to direct users to potentially harmful content or for SEO manipulation. The presence of multiple PDF files hosted on distinct domains reinforces the link farm characteristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pvcmikser.com/upload/files/76228034284.pdf In PDF document text
    • http://www.huntsvillepr.com/files/files/somex.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/52786226293.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/gawedusifemukavuvuv.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/cbd597669daab2ab6b3f2c7a209f7787/40047547821.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/72880857711.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368f76481e6---momugufajulet.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/25847633496.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/wurijakoxewefekirone.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/17901963417.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///87054945234.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210909161950.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/jobefaduko.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/11291643511.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/tekuforinasuwunufu.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/64967704596.pdfIn PDF document text
    • http://zkpower.net/upload/files/torowugumufofuzif.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/9670270767.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/xetomebupudisusum.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/16354361246.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/16980477585.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/tezodez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+watch+floyd+vs+logan+freePDF 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_off0000e07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 17388 bytes
SHA-256: 9abe3386d57db4936bcfdecd420294a91ca27a9f274e5f6cad58a294e1b62c18
font_02_sfnt_off000125b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B7 10920 bytes
SHA-256: 993068d32baf5e728037b5c7128270a1d0db0615b3d39f5e0eedef71d22ee753