Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16a6850041ff085…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 12:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c3a962ac8126f1d6ced3a1199038d6b SHA-1: bc5c220901509aaf20cf223d341cd0a318319a58 SHA-256: e16a6850041ff085b4d65a6ec35748e7426013957f717cae18bcac18cf389f15
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to disposable PDF files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://stagelight.pl/userfiles/files/bosuwuliwi.pdf In PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/46876008161.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/rabosabux.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/17263581371.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/45162352333.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/feresabuk.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/25138979980.pdfIn PDF document text
    • http://cwesp.biz/upload/file/37439520832.pdfIn PDF document text
    • https://trexanh.net/upload/files/86902325692.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/suvajedovida.pdfIn PDF document text
    • https://12tiga.com/contents/files/2937220782.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cb6708db8---65838844660.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/jinujakekapex.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/jevapuzuzag.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/rewamavo.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/47010003158.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143631d9940e---sunasuledametido.pdfIn PDF document text
    • http://hbaoge.com/upload/files/97816669623.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/38382653144.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/fesaxasutetasukoma.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/wikeseni.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/48580552356.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/fesaloxokonudaroxaf.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/zufaw.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/ferituwasajabuzedoteni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+carpetas+ocultasPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 19400 bytes
SHA-256: d653c3818df1a32ae8707c6361e842913a87757067e2f2b4115f4f4f5a9c5f67
font_02_sfnt_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 10588 bytes
SHA-256: 9ab0b2325e59bed12f59424811523e528d4b172806c68910e9935ca212cf09e5