Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4b831c37664e5d…

MALICIOUS

PDF

73.1 KB Created: 2021-10-08 07:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: aca409ac050763d2068382e7ac766bff SHA-1: 99a280004da326141a55f2ee1bded037ad718c4f SHA-256: ba4b831c37664e5daefb3204db9dba49ec3f89195f00af10378415b9b859a658
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ristorantebiscione.com/userfiles/files/vurofuw.pdf In PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/nedixiten.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/70919292143.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/98112895925.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/59850856490.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/13114659196.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/19771994609.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/28521327619.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/tafaxebivitinuj.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/13657328024.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/94571483077.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/sigidovuwew.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/gogukeduxomazuru.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c511516a096e9a9b237334a91efb6ee5/boluganugenovozunofakoku.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/pamitoxebibovivoxekurewa.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/rokavazu.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/276204541.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/pegivifurijoze.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/rubil.pdfIn PDF document text
    • http://greenegiving.aboutgiving.net/sites/default/files/editor/file/29537899938.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/vopolepotedo.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210920152724_1vp094.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/rakimejiv.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/buwurakilizumefawo.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/xepekizemavabitowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=defeating+meaning+in+tamilPDF 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_off0000b9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A6 18240 bytes
SHA-256: 0558316fd461ac4dd7cb09039c263a05c9ba0668cdd8e979c96b0e1bcafcdcc6
font_01_sfnt_off0000e879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE879 10172 bytes
SHA-256: 2f2201515a006d7a88dfa5b37ba256c46980477a1905b004daf8d6dd46d1e129
font_02_sfnt_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1