Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39f053dccbfe5cc…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 01:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ddabcb1bb09f38cb230852d9fe56fcec SHA-1: f7a6f23459680e1f9614a3900cd203bad9e52d0b SHA-256: a39f053dccbfe5cc4a3bf1be0cb788b9a0799f9a0e80939d0b1f3ed9eeb8f221
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to the document's nature as a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=proxy+pirate+2021 PDF link annotation
    • http://khachsansapa.vn/webroot/img/files/kebatumuzexuxonojujimefa.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/vugewed.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/pinidow.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/2c57bf67e8b24673f0c31976328dd9b4/kogupapatubimu.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/23430881644.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/64320219490.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/setuxopi.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8f702750f---fizutufojaxadetuk.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/sezufuviwitosobanoma.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/wuvetogalopij.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/89298229607.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/kujekivukizonowonivugo.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/fuzoripuzezefot.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/8752174008.pdfIn PDF document text
    • http://safarang.com/basefile/files/rezatidavudi.pdfIn PDF document text
    • http://melabo.com/upload/files/56728509010.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/45372165799.pdfIn PDF document text
    • http://119pump.net/d/files/32520425763.pdfIn PDF document text
    • http://liepasmuiza.lv/userfiles/library/84418513024.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/nodebesel.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/garuwapujabilidasojujen.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_off0000aefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC713 10436 bytes
SHA-256: 529532160dc4574711ec98fc621dd2bb11200bf2677b212f49163d01c2e84ab3
font_02_sfnt_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 16084 bytes
SHA-256: 38eaafe364f287c5eca20d47fc13ecac9428feb7aea98be56f6954cea1991f23

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