Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12cbfafb6cc285e…

MALICIOUS

PDF

68.7 KB Created: 2021-09-24 16:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 750d17c38ef14c81ca2e3254de51df2e SHA-1: b9f02ac5ba645f405fbae5b08fd78491cc7d2218 SHA-256: c12cbfafb6cc285e3c32e35a9c362444563513e89d1307d00047ab403f028824
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://archism.ru/uplcv?utm_term=papyrus+fight+simulator PDF link annotation
    • http://phoiinnhiet.com/images/uploads/files/5256726522.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/gixofofomux.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/wumolobinakewugemefapeb.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/46221730770.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/lumin.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/bukituwakevumejovafosa.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/180506731.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/ribobekof.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/wanevogebubid.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/wusenikikukuxigoje.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/53161249232.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/59483904658.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/14520093793.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16145da3cb123d---37020807616.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/lepizeninufejisado.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/ruxalobuzusunefegu.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/44911639687.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/77678722301.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/81043717928.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/dilat.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210912075421_vdi0b0.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/83772468344.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_off0000af81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF81 10784 bytes
SHA-256: 732c3ce9b5df70a64c443143c40769dad9712d167e5ad85c1808f5f7d2adc200
font_01_sfnt_off0000c858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 14700 bytes
SHA-256: f89ec4bc88f3b36c2c43ce5d38198e54fbb512dbfd71893b3afaa1e1f960fcf0
font_02_sfnt_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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