Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fff2c8bc041696…

MALICIOUS

PDF

78.1 KB Created: 2021-09-28 08:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f44576c1daeb94c6a03226d5a3653c9 SHA-1: 0c1f7a8b90a8a878fdb2c0f712d2c92f67c1e545 SHA-256: c9fff2c8bc041696d4234f63ac0f396823078c2ca08caf1df6deca953e655c6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDF files hosted on various domains, indicating a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and the nature of the embedded links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://equalland.com/uploads/File/sujokixunefinufirab.pdf In PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/kovojili.pdfIn PDF document text
    • http://budropol.de/Upload/file/jufasoxer.pdfIn PDF document text
    • http://trieuduong.com/images/Download/52389855449.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/zitelinezunogikiw.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/41702785418.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161393e6269849---xorowusupi.pdfIn PDF document text
    • http://comac-international.cz/userfiles/file/ketizikudesusufimu.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/54289423399.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/15185781484.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/mopijetuxovilo.pdfIn PDF document text
    • http://355353.ru/userfiles/file/11112810895.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/budiwugaresefiwike.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/jobejasatalovowekapup.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/2736387448.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/pafesarazi.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/22163846169.pdfIn PDF document text
    • http://araonline.hu/uploads/file/96641724636.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/62539183660.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/54820015942.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/fafoxikuve.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/74324310412.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/lulureminowerulikigu.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/73892917396.pdfIn PDF document text
    • https://obchodsezlatem.cz/upload/files/duxeriv.pdfIn PDF document text
    • http://esejsc.com/upload/files/wigebezoginu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=barron+toefl+ibt+17th+edition+free+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_off0000c193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC193 10664 bytes
SHA-256: dca38d05e889702d80c676c6f8afbf3efa462482e848d61b66353eeb308de932
font_01_sfnt_off0000da12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 21440 bytes
SHA-256: f11c68e9fbfd9143aec33fe9d8e0f9cb10998bbc83bc4ea72196978912393068