Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ecc5866a60b51df…

MALICIOUS

PDF

88.7 KB Created: 2021-09-18 02:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 54c2221cfb0cd4e269a7a282fbc8e2e8 SHA-1: 5737a55f4667c02bf34a6b770980cb1051d76ccc SHA-256: 5ecc5866a60b51dfa4243e5c6be61a65bdc8dee7d2cd1b63fd7cfdd00ae3a204
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://philabc.ru/uplcv?utm_term=ayoba+download+apk PDF link annotation
    • https://teamcode.net/upload/files/98907044709.pdfIn PDF document text
    • https://jck.ro/userfiles/file/dolopefapadusodozofi.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/93906031298.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/risajijijak.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/86566443445.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/jagokigevududafevavakevum.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/wukakemaw.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/99544112156.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/40635964227.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/fezopugafikob.pdfIn PDF document text
    • https://anup.bo/images/files/numal.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/rexupigava.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/93826085304.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/nawaz.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/waleta.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/9914860854.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/72138074873.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161382b0931cd8---samojiwonafadanif.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/somivunubovulojakebeva.pdfIn PDF document text
    • https://egf.tw/test2/images/file/movab.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/nutokabo.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/wekevep.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_off0000f2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 10208 bytes
SHA-256: 087c3468520c4c266847c6b9c24ee55c026df2b2074a761430271cc62568a3a2
font_02_sfnt_off00012190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12190 19768 bytes
SHA-256: 4751208e75aa148d93eeb6ed23ca1fd0e24fd15c7c1aec1077a753e96a28e6d0

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