Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e2b8d0383f9c15…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 21:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cb5ef04ce4d4b29b06f2124cbcf6a91e SHA-1: a90b9e74e53d6e60530ba88e4eaf809564315bc0 SHA-256: a5e2b8d0383f9c15d0bcadf358b8a226b2b484a49e6cd35191e56887792d8968
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=download+ps+2012 PDF link annotation
    • http://mamolenasnc.it/userfiles/files/jozidok.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/bobosiweba.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/wuremixodomatitesod.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/63626303427.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/28477996192.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/77031005716.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/zuvovokexofixuwafixipuduf.pdfIn PDF document text
    • http://surtek.biz/image/files/20150402_073307.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/89899060955.pdfIn PDF document text
    • https://auto826.com/uploads/files/vogoda.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/kibavirusa.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/74422664238.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/fuzuzaf.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/11175164121.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/nogamirusuxuvomunikopobad.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/fokelivuvonipufoxore.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/2584335468.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/dibojavoj.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/6710823474.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/42691080257.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b361f3766f931bf97b8ccea2c2856da4/gevuzenuwus.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/memotupuzedaweruso.pdfIn PDF document text
    • http://traviet36.com/upload/files/65958221843.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_off0000ce3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3F 17052 bytes
SHA-256: b6bcf1fc979bc1ced0681e3678ad3ef405fd73e77e0d49bd29242ed877201419
font_01_sfnt_off0000fa54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001126b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126B 10344 bytes
SHA-256: 6d65e56e9a5875fc4a9d9dc0a6f01a1362c7ced3ab63d19a9b2914d9d9ecee1b

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