Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ec72cb25505579…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 09:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bb85e0758195082790756f91e56c7805 SHA-1: 13de9d7a27007c9c3fae337971a470d12b09e7fb SHA-256: c7ec72cb2550557926d705e355d8296688b3a53c5fbf2f6631a20b3851f358b2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting the user to malicious sites or initiating a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=scary+teacher+3d+download+android PDF link annotation
    • https://milosislandrooms.gr/userfiles/file/lunaz.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/72574298069.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/30092842562.pdfIn PDF document text
    • http://skncn.com/u/files/pawimu.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/93816977405.pdfIn PDF document text
    • http://labsshop.com/d/files/66050881572.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/df3700d627fa807f31a86f602ea8e48a/migigogolilekivegafevab.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///tigisumodapomam.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/wavokojonutononipulupivef.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/53633264036.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/18491414849.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/ruxuf.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/c779bd1fe70849ef1d5051b74053b17f/ditukesolutu.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/18176735110.pdfIn PDF document text
    • http://eko-uklid.com/files/file/kenuralemipozivam.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/81969639667.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/jewuvikasimexan.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/22593726822.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/38937206620.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/kodafabaxozirale.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/39188919472.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/37750164813.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/49312330539.pdfIn PDF document text
    • https://photofetimages.com/82309296501.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_off0000b2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A8 10744 bytes
SHA-256: e2dbd9a1c60acdb575d2eed39a6b8f3992c091634e0475d53e78e4775356e4f3
font_01_sfnt_off0000cb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB62 15072 bytes
SHA-256: f46a186b99e33b67522859813175062cfe83e70fada4b57c3aaa4e3fcfc1cf33
font_02_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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