Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b1aff27e6aca28…

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 14:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 45f31baf1714f3e25f26c35577fc2046 SHA-1: f4d71818d744b503567621018b4b75d81287b431 SHA-256: f5b1aff27e6aca28253ff0907c6be88cfb65b663e9ad9c59efb00a010ad78f09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://communeouchamps.fr/userfiles/file/mesilixenexibuxoraxom.pdf In PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/rumogavakemenaf.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/bedemodafaxed.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc9ddbba3---46742977677.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/tufejijalim.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/xonana.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/fefipunadakir.pdfIn PDF document text
    • https://premiersuli.hu/files/files/vepotikog.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/64817874395.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/82237208660.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/zizagujiwilan.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/nenegevusodu.pdfIn PDF document text
    • https://majubesar.org/contents/files/66177625283.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161426619538b9---66641694523.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/97488309709.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/xopabunu.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/kobatupakikeza.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/96966564538.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/nakud.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/wanogusolisirepodeduxab.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/pajikubowumomu.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/viwerutisawopuvejej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dx+dy+xv+yv+androidPDF 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_off0000b222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA39 10080 bytes
SHA-256: ded4dbf8e0847aa2305ae41999e2e2df28b9dcd66175d48dab68ec96a28b5112
font_02_sfnt_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 19704 bytes
SHA-256: fdc710462827711d723f4ed3e59118f763c176f9f14b2163e06eca4001dab814

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