Malicious PDF — malware analysis report

Static analysis result for SHA-256 e269211826a0a777…

MALICIOUS

PDF

76.7 KB Created: 2021-09-21 02:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2dbc8e649cf9610283968786d96167e6 SHA-1: cbdfee4d5f06d385bdbd1afb9aa623ff9be1afba SHA-256: e269211826a0a7772b99dbeadacc907394a4997f5763f81a50783844f88b7dfa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a significant heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or SEO poisoning campaign. The primary purpose appears to be directing users to a network of other PDF files hosted across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://magnanerie-cazilhac.com/userfiles/file/gufisunipetatuwe.pdf In PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/64707884870.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/jebamewefilozu.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/jedajelaloti.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/3708472407.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/85467306169.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/54151419578.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/38541266785.pdfIn PDF document text
    • http://cbstav.cz/file/fofukilusatogubumibodi.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/wojubomazuji.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/41367751941.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/xexegi.pdfIn PDF document text
    • http://datatech-int.com/userfiles/file/midizis.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6d57bca87---28258676280.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/lupuzifowubanejunupojana.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/20697008055.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/noduzo.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/17586994378.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/34167689080.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/52573053080.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/merenisonebumunaxeziguze.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/kevusevadi.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210920115756.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/wuwopale.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/18701847179.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/567ac2b094e7400a32517e5953ba2744/82269317233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=diagrama+de+flujo+de+proceso+pdfPDF 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_off0000c8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 10992 bytes
SHA-256: 2697501e0ab76d3a619623881e4a20f94d71254157a211c10513c5d347f2c210
font_02_sfnt_off0000fa4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 16948 bytes
SHA-256: 69f9d37fdccce0c25496b04d214c41bef43c6f947b51d3a34ab0c766867de9a3