Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b369483ef89846…

MALICIOUS

PDF

83.7 KB Created: 2021-10-11 12:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 827276cde193ba79555882dbee34f4ec SHA-1: fb1fb3fb27454ec8d7004959773d7b016977b3ce SHA-256: 56b369483ef898469193bd35b9e410522189015286015e5c79248cd6926f187a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it's part of a link farm, and numerous URLs were extracted, many pointing to disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://y3stwk65l-mn9.com/contents/files/86622591038.pdf In PDF document text
    • http://geomanteia.com/userfiles/files/85673138869.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-16/20210916123739695053.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/97800627489.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/mamobepo.pdfIn PDF document text
    • https://ms1oke.com/contents/files/didemikimexojinurul.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433e2488114---xeboxuxemagab.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/tosulogeva.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/27374536752.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/72566833524.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/43879832760.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/tomujedazezab.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/251106444332.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/31152741724.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/80048283457.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/72826019931.pdfIn PDF document text
    • http://zxsolar.com/d/files/16798357599.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/60235902466.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149635f86254---xebizoleripipiziwejebope.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/norokuf.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/u-9XGpgKpwY/uplcv?utm_term=20+cfm+to+lpmPDF 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_off0000dd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD43 20444 bytes
SHA-256: a251092393e62cbb46808a9a77c8e841efc74b037c5daa5baed2f009007c6537
font_01_sfnt_off00011359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11359 10028 bytes
SHA-256: 1ea95e599e6354b234223595121451d87c0e8f8467dcb3df4b8f154b855132d1
font_02_sfnt_off000129a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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