Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6dde1ab3ed9bc0a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 06:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21b98b81dd50db40cf57536c54ad6f93 SHA-1: 7e2b5c0b802f4eee6e702b31ee604004ef392b8f SHA-256: a6dde1ab3ed9bc0ab5f291c5ef3b887fcd12ae6755e9c8fe47adb57df4ee337f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely for phishing or distributing further malware. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://dycelife.com/userfiles/file/fofiz.pdf In PDF document text
    • https://landtop.com/filespath/files/20210914135524.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/vutosaxosoramoxovebebufaz.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/14721505098.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/mavusewelurukunuvegobe.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090711573470554.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/25533989752.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/muwolipusodezalodil.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/kiluvigepogojuko.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/47913208355.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/tenosobidov.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/muzinuxipajodulo.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/vegexematot.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/sj2vk3mof5s2615qb56gjnpcp0/buxetizutovez.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/26764111004.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/gelimamupog.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/72273200064.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/wapiketobig.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/jijeluzewajunonemapisota.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7eb11342---43194604843.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16130e9111f5d9---fesijuga.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/39529336326.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/kigugebererenubifisone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=only+fans+premium+hackPDF 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_off0000db35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 17272 bytes
SHA-256: 562be122eabbe6ffb43adb244c435d2c9830362f9b307b6ae0e2030f2889c5d1
font_01_sfnt_off000107e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E7 10860 bytes
SHA-256: 1503e94fc712df09802abe2bcdad2936957cca5ffe1e1eee056d9d306d2ed737
font_02_sfnt_off000120dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1