Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5549b11b6445e5f…

MALICIOUS

PDF

67.4 KB Created: 2021-09-25 18:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 57e6f2147257041665327f8674e609c2 SHA-1: a42004c15f14b307679d33d9b84bb1b1d336bcd1 SHA-256: e5549b11b6445e5ff8f45e7bee4ee24bcc44fcf2a2a83f27d0c54d9c79db50b3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous external URIs pointing to various PDF files hosted on potentially disposable domains, suggesting a phishing or malware distribution campaign. The embedded JavaScript is likely used to facilitate the redirection to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nayyaralidada.com/alpha/ckfinder/userfiles/files/bobememuniwiroriva.pdf In PDF document text
    • http://jocoseatee.com/userfiles/files/nuxaneguwigufojo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/15467611395.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/82497865912.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091014204480554.pdfIn PDF document text
    • https://angkagenap.com/contents/files/tozazodefakidezurenufevon.pdfIn PDF document text
    • http://bionazorat.uznature.uz/userfiles/file/17009995259.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/53794284890.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/17699131529.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/dadoserivudu.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/gusexegasirigisawosinin.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/bitif.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/gozamobanatorubatupuvu.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/dekovagamulevomodutati.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/witomuzifud.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/dukexubuxojomegesedajelot.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/84366737029.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/deneravobirisidol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=instagram+story+saver+video+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_off0000a886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA886 15464 bytes
SHA-256: dc620c325d557f60128a695465bfb16734405b0daa098d75272b733996e701fb
font_01_sfnt_off0000cf9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9D 10808 bytes
SHA-256: 4307cbb87070439109acb3b0ccc5b75f12f65b7e5f13f064efa07d40b67d8bab
font_02_sfnt_off0000e85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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