Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ac50af79f52192…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 01:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33b7a9e6814fa81c7cdaa2b6572f13b8 SHA-1: fc5272affa83fb46892a2619d7d63dd45f576c3f SHA-256: 76ac50af79f52192b99a47996d681414f7cb053ea31209c3da940465dca3d718
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://jongauger.com/ckfinder/userfiles/files/ritejevis.pdf In PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/71544911427.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161436789c9ca3---22275383253.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/68048767307.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/sigagumanafu.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/dezozotulo.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/67907612525.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///kutawuxesemejob.pdfIn PDF document text
    • http://parentini.it/userfiles/files/57207812818.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/pasutazavuk.pdfIn PDF document text
    • http://chapelguild.com/images/usr/58618284867.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/jezisepunima.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109010947124708.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/venuxufa.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/wamukod.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16131a25468c7c---nirevurepepesesopigikul.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/rozugofujexosakuvu.pdfIn PDF document text
    • http://traviet36.com/upload/files/16532385536.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/vijofubomuxasodixupun.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/37916911068.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/69681623613.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/35944378059.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91659104778.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/faboviwadimojurawudoliv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=botim+free+video+call+downloadPDF 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_off0000d185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD185 20580 bytes
SHA-256: 7280723c3eb8771e933670a1736bd16ccc3eab1bf977c82a764e456df45f3477
font_01_sfnt_off000106f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F9 10672 bytes
SHA-256: 110e5d774313a0f529740102840c35e16c190e8afa2c30fdf7d385e26436c94f
font_02_sfnt_off00011f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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