Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c2db870302fec5…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 11:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 018c2d8016a96190bd1152f5d1416e89 SHA-1: 01fb287842ed65dd1368aa662b9cbfefe0775368 SHA-256: 28c2db870302fec51dde9d0ff7c4521b4b049acaba36fe950877154afff76a2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely for phishing or malware distribution. The embedded URLs further support this, pointing to various external sites that could serve as landing pages for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=dua+for+parents+happiness+and+health PDF link annotation
    • http://gazduire-domeniu.com/UserFiles/file/48033188189.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136af307c4ba---kamizer.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/vapozebepakexiwunakoma.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/rupiputag.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/16766102869.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/31282037900.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/01d9bc4d9a4dfafa4c6084ecc5ec65df/fewenavivofeb.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/59616276187.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/57796195194.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/memezokade.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/94869628321.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/likatowugusifozunawuzikaw.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/30391005067.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/3119195234.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/tazokufadomiwazemi.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/23069041628.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/lorepewinobaju.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/39494762691.pdfIn PDF document text
    • https://edex.co/userfiles/files/xikomaridemolixedamarome.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/62231193865.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/85214531203.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/78681144842.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/45276210020.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/dowikakipazos.pdfIn PDF document text
    • 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_off0000b6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C8 18588 bytes
SHA-256: 7a7c31d4f6e2f7454c87ee1c1715ad0fa8d2741e9d750fe39a6f2c825f825866
font_01_sfnt_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 10696 bytes
SHA-256: 4a544d15a2275c2aa3829c82fefd6f5bc71c9ca7c9c9166c764a46ad0a8dbfbd
font_02_sfnt_off0000fea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1