Malicious PDF — malware analysis report

Static analysis result for SHA-256 59438ef928214066…

MALICIOUS

PDF

79.6 KB Created: 2021-09-13 15:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca2e671c72841b626baf0d0297db98f4 SHA-1: 6c772b0b5336c5f77a01e7fd7d88742d0e13bb4a SHA-256: 59438ef928214066fb0c7c8bbb949ca42d3bfa08514d5c7854e6ed00e69e4403
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious PDF files, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links on disposable domains. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://belst.by/upload/file/bamojimoduvinosakonogemib.pdf In PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/46080568984.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/wagixolovozekimedu.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/kugisoko.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/50049463322.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d185129ae1---xiferawuzalogixipor.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/sefos.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/3709999943.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/bozinibaxutixalizadu.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/8071367482.pdfIn PDF document text
    • http://kelvista.lt/images/files/18090830743.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0dbd86cfe0b3e3b12f156d3f69bd8625/60020365601.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/43438405043.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/77753699077.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/jafunimidibogad.pdfIn PDF document text
    • http://gptools.net/userfiles/file/zoxixelosabadenuw.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/12119662033.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/53397375244.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-12/20210912074638578842.pdfIn PDF document text
    • http://atrsara.ir/resource/files/nufupepemojokasuwez.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/dawogu.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/barajiwuwikabaralez.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/jewufisiboromavakunapawu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137d91f086c7---17557659677.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/zetatezif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pooking+billiards+city+apk+modPDF 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_off0000d1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D6 11072 bytes
SHA-256: a455a5a2dbcea4a80d7fad5a18b8a88a75194a737c02e1269e8f557fca21011b
font_01_sfnt_off0000eb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB44 17556 bytes
SHA-256: 3a56db2d45502b4b11a4561ce92cd7e5f2aa23667c7820b50e1c1742122e65d5
font_02_sfnt_off0001188b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1