Malicious PDF — malware analysis report

Static analysis result for SHA-256 f345badf145412d7…

MALICIOUS

PDF

98.1 KB Created: 2021-09-17 07:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b93522f4fd6c0566d8c172f0321b3306 SHA-1: 6da185fbedad05e7d07e126aa8c11d2f1139f8fe SHA-256: f345badf145412d7dd4dc173040b67addd028c71cfa26a7c67a1a126c9eed9d2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest an attempt to direct users to potentially malicious external sites. ClamAV detection and ML classification further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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 http://www.specemc.ru/upload/files/pesalifudaretezu.pdf In PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd28604cd---85630161104.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/vipejolosofafikexifufo.pdfIn PDF document text
    • http://belniig.by/public/file/62607025768.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/92386727923.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210904004746.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905221501095725vd32ws.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161349450d7413---rofotonirasugole.pdfIn PDF document text
    • http://ehlibeytalimleri.com/resimler/files/zoziluvagisatamomivexorek.pdfIn PDF document text
    • http://carszana.com/image/upload/File/nuvof.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/rikozupe.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/tapujaruwewotobefema.pdfIn PDF document text
    • http://abwva.com/uploads/files/feberunukafevidiresi.pdfIn PDF document text
    • https://tele-video.ru/upload/files/sujeburewi.pdfIn PDF document text
    • https://mimpidia.com/contents/files/26776210657.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/66389359938.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/40291327555.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/robujagidedunuxasaximuji.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/35305592602.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/pebovesukufufewovoko.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/topavudi.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/jenigeziz.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/40566542268.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/nenimuj.pdfIn PDF document text
    • https://demideopool.ro/ckfinder/userfiles/files/37651110556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=kajer+meye+chudar+golpoPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00014748.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14748 16932 bytes
SHA-256: 372fec1cc962f72b5b2a90baa50085f05436bd6bf753c09a36c8b5dfabc5fe92
font_00_sfnt_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_01_sfnt_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 10832 bytes
SHA-256: 76c93a12e94351aadaf8502a33eb1394b497272e3c4f5cfe5ea5ff0b996f95b1
font_02_sfnt_off00010bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFF 23408 bytes
SHA-256: 68828e8a2562e12acb74b9e90cb19619ec732d5f3bd4d83b247134f9b5046f2b
font_04_sfnt_off00015ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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