Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c58955f5829213…

MALICIOUS

PDF

69.4 KB Created: 2021-09-17 09:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c8dde9aa54fc73cb629db58ecc0ac7a0 SHA-1: c4e351cf7a5b9392cc6903e1d64affb68fa6e961 SHA-256: a7c58955f582921364a3490dcf1e2a7f1784bb7b018e64525c56309241ec443e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-only design with a clickable action, typical for tricking users into navigating to external URLs. The document body is heavily obfuscated, but the presence of numerous embedded URLs, many pointing to disposable domains, reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cooperadora.grupocreartel.com/documentos/archivos/21512248111.pdf In PDF document text
    • http://eclickapps.in/userfiles/files/fujakixutapadaxojibasanex.pdfIn PDF document text
    • http://vanhacollection.com/images/files/54033172707.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/tegakovolasojozipi.pdfIn PDF document text
    • http://pinxedien.net/upload/files/konesorikolakole.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/62170703887.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/47685622464.pdfIn PDF document text
    • https://tenhucchi.com/upload/files/rikulipisipolekisufejezeb.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/40699363302.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/31878395597.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/boloburobirirutifogimat.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/34677379137.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/xuruvulowalat.pdfIn PDF document text
    • http://dlzj.net/upload/files/202109100518397272.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/34242842977.pdfIn PDF document text
    • https://eniedu.com/data/file/20210907175215.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d40cd1d662---dexejuvag.pdfIn PDF document text
    • http://feg.vn/uploads/files/80160848554.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/64141082076.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/tanelasagexilononobufav.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/54929492698.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/46222984668.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/viviwezogusazejenubafelo.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/66148104382.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348758a82ea---jaxigafis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+com+file+transfer+windows+xpPDF 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_off0000b33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4C 14108 bytes
SHA-256: e22d027e2e06762f737074b643514b691f183f84aed5f330333f576e0f221c46
font_02_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 10948 bytes
SHA-256: 10a649b834ef3f5d5a328255d0de49b53fd7b3071973e2c30fbc1447ee120f6b