Malicious PDF — malware analysis report

Static analysis result for SHA-256 576cb1521c07ded6…

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 11:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 49e3c5efb5dddab972a71f87f1d09813 SHA-1: 55f5b853c8e480a2c588cee80251121a83a66ae2 SHA-256: 576cb1521c07ded628b246dc537297da178be679dbf1c0eb50428c3f37f3854f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external URLs, many of which are hosted on disposable domains, suggesting a link farm designed to distribute phishing content or malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://cructi.ru/uplcv?utm_term=block+site+on+chrome+android PDF link annotation
    • https://vilus.cz/userfiles/file/pekozonizonevezej.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/zajivekaxudi.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/63146717877.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/16430222681.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/kasupopovoverunok.pdfIn PDF document text
    • http://7serve.org/userfiles/file/20210926015410.pdfIn PDF document text
    • http://skene.es/userfiles/file/83870947889.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/97666729294.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/88277973035.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/87695150004.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/menuwapokejodikusoxisexu.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/pigewu.pdfIn PDF document text
    • https://datawire.gr/files/files/puditilijaxagapabule.pdfIn PDF document text
    • http://airfa.it/userfiles/file/88427584096.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/20443688448.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/bch5aite2ol97np7719prqsam4/83612868704.pdfIn PDF document text
    • http://seamacros.com/upload/file/kupoxenowe.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/gakegudatogemudipuv.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/25969687971.pdfIn PDF document text
    • http://zmz72.ru/files/file/49486474043.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613509d50a474---46733431541.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/visalume.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/pifixutavu.pdfIn PDF document text
    • 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_off0000ae85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE85 10780 bytes
SHA-256: f47dccbeee08176dc511a32a78df98c58f0296d630fddc54c08ce12c6a9ed726
font_01_sfnt_off0000c72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 16616 bytes
SHA-256: e691e2dc177dc352dacc1d4e14ea419932f1abc332257a9d467824cd46c9b185

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