Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23ab131859e5ec5…

MALICIOUS

PDF

67.9 KB Created: 2021-09-26 09:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6911d43961faf2f891146a7e506fc0df SHA-1: 294b30ba3cb0237702ca7c0ecad24de4e505954c SHA-256: d23ab131859e5ec590f42b73796910149122a01bcf19f22b1538daf4a8cb95b0
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic 'PDF_IMAGE_LURE' indicates it's an image-only document with a clickable action, designed to deceive users. Numerous embedded URLs, many hosted on potentially disposable domains, suggest a link farm or redirection scheme to a malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 67 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 http://getrade.net/uploadfiles/file/52689579399.pdf In PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/3710920174.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/21340083605.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/fuxawujoluka.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/ximelakofora.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/84677562476.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/disopaxegev.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/zegolu.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/18904216903.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/39416168004.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/16752024816.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/64398372560.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090117181839.pdfIn PDF document text
    • http://saint-party.com/media/file/zuvupamunojekupatudovalim.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/40416610293.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/bawabifaw.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/11599004989.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ne6gposjp99a622fatj8bfhuoh/3570356374.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210903094741.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/wotigez.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/dadifizagosawaz.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/39726009935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=zack+snyder%27s+justice+league+director%27s+cutPDF 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_off0000ad47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC559 14192 bytes
SHA-256: 1ebe8cd74f079622a6928c51ccc03e407bc390abe8e4cb676e82f134932ebea9
font_02_sfnt_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 10980 bytes
SHA-256: 05958b857ef7af4d88aaee756b17f967812c3fca86a417377a39fdd0b8e5ffae