Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f62af7ebda1ad66…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 16:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6adad9ee4c101b1ba1123c3d71a8aa2d SHA-1: ed10e475ffcabd5ad5d2e6e203f83a44c2ad836e SHA-256: 3f62af7ebda1ad666f6a71034b11a87a542b536916abc0620c1db2c3856efaed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to lure users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://lazdynumokykla.lt/userfiles/file/ribofefej.pdf In PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/45389639334.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/13190948594.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/84371676428.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/90727982511.pdfIn PDF document text
    • http://pi-consulting.ch/download/dedobaxanisisoxijamegodi.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/nosirakizajujanidexifa.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/beseviwisusem.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/68078551054.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/pimedobifawaxijepas.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/1490518039.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/guwelisuvudinukujodekev.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/95839575192.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/mp2vldi2hed8trjippi5a7vlr2/pezexed.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/34246977626.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/41721564654.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/zezulavoronisukitop.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210917_1EFF939135F57CE1.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/fexiraranob.pdfIn PDF document text
    • http://ttc-investco.com/img/files/vijobam.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/xapilazerewanimed.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/bofajegimojulam.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/81233821745.pdfIn PDF document text
    • http://laserinnsbruck.com/static/9398507854.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/jegodonejodod.pdfIn PDF document text
    • http://synhbio.com/upload/files/26929077239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=easy+game+app+apk+downloadPDF 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_off0000d837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 10720 bytes
SHA-256: 39dfb199f53aeec50542c7a8472613809d1815f3e571ac0af3d3990a7c4e2a6a
font_02_sfnt_off000108c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C1 17556 bytes
SHA-256: 6444102cd984980c0c0853259f38c0b9c6d550da3910b9b8f74fe7a3c2f265df