Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea61bfefb33f0fb…

MALICIOUS

PDF

96.9 KB Created: 2021-09-12 04:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5da1d7cea4165e066f1518d9b37ace9a SHA-1: 164ba48eb8580aa965cf8dae161bdb491f86b9b8 SHA-256: 8ea61bfefb33f0fb182a267db2159c21decef60cccb5879f017c545afce24ad8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it may leverage embedded JavaScript or other exploits to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=stories+for+reading+comprehension+pdf PDF link annotation
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/3e58fe4a69c221597c46cc89edcff1a2/bawamebovijifixulunaziran.pdfIn PDF document text
    • http://gapp.fr/medias/files/78205337865.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/pivodulidalakukuzuxisofi.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/52216334687.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/66362676240.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/cbb986b11d1b101f50dfa01fd03533a6/kasebixijil.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109051352409289.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109120757397334.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/21593045504.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/mamusupigilafabu.pdfIn PDF document text
    • https://pecintajp.com/contents/files/80473821257.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/56023363719.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/zosidumukedazegezolofep.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/53195715937.pdfIn PDF document text
    • http://lgassociates.in/uploads/988440140.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/seditosofilal.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/93877513202.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210910_21966EC5FCD2E429.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399401dcbc9---ditimezefozasiseripu.pdfIn PDF document text
    • https://marosme.ro/hirek/file/jirud.pdfIn PDF document text
    • https://curvy.tw/upload/files/68643145800.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/47546493848.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/87874489202.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/71063330299.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_off00011243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 19204 bytes
SHA-256: 65fdb5df3a05346b30e5d478c3103e259ccb7ed1770f14e844d4712e88aa1a69
font_01_sfnt_off00014411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14411 11096 bytes
SHA-256: 767337a89bdd51c7f9fb705871c323ad2d64534a93a68787d4425361c34c9cbb
font_02_sfnt_off00015d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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