Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a2fa25225ea62f1…

MALICIOUS

PDF

76.4 KB Created: 2021-09-08 14:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c7c54630d5201d4829debd9330413753 SHA-1: 92ee0275f2417de2a16f4027190866c3ea7aef92 SHA-256: 3a2fa25225ea62f11c0aa14cfa717ae6b484ea02889c0fb5415baff267f8b0db
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the PDF is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://serextion2006.com/js/upload/files/xokidifediwititepona.pdf In PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pudidogovabemij.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/98654868078.pdfIn PDF document text
    • https://tavio.ru/files/file/woluvamida.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/61551244544.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/kigamiwazoxirewagunufobut.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/98195189049.pdfIn PDF document text
    • https://btegypt.com/file/78502220565.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/29817810084.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/pewazipegufojovoduxafe.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/nugelaboxapitetoxa.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/60329101291.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/57994079784.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/kerutelopiga.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/zikanemoxoj.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/biwomozi.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/gogot.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/27134745781.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/52809548348.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/ragorolatu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135e644184f5---47870442854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=school+event+proposal+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_off0000c746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC746 17124 bytes
SHA-256: 1331db90a8452d0ebd0782c41a17152de47a95e7fcdf89b9346cd603eb6326a0
font_01_sfnt_off0000f3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCD 10764 bytes
SHA-256: 565f5015a352979e5b710495ef13f9d637cb123a52ad38345893d039f06bf7bc

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