Malicious PDF — malware analysis report

Static analysis result for SHA-256 19453e462bc860bb…

MALICIOUS

PDF

71.1 KB Created: 2021-09-21 11:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c455115df7f3b22461abf96a6cb0ede SHA-1: 008cfe5a51423fc67ede521e733bb120096cd570 SHA-256: 19453e462bc860bbb618e605c964be99284afb3fb4dd4747850f559beabaf972
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161389f1f2a7aa---gaxofo.pdf In PDF document text
    • http://df-2.de/images/daten/file/xobax.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/29528825610.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c983f3c9dd4404f33896d74e3b4f7bc0/kikobebamudipuparug.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/vajipaj.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/61348534263.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/wugisilu.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/47076712654.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/buduzoj.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/98496674106.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/20128966557.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/kufodozaribupukofulogu.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/46292150513.pdfIn PDF document text
    • http://recrute.fr/files/files/38892016107.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/kixuzuberefiserixogolow.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/rajivurog.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/tadag.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/54707354155.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/jugavelopuji.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/48299035141.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/jidigukalozolakiteboxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+road+not+taken+turtledove+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_off0000b340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB52 17212 bytes
SHA-256: 1f09f1bf8c85ccd152c0961e0461d8331f092ee9b4f5d262172a798b2028be01
font_02_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 10556 bytes
SHA-256: acbdf80aee2513dd998dd32320d972811078c0c0218e1b348fc9bd6ea0dfa9c5

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