Malicious PDF — malware analysis report

Static analysis result for SHA-256 15424a23f1126a5b…

MALICIOUS

PDF

84.8 KB Created: 2021-10-04 13:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 021b145e097498924ed0bd1d3ba26690 SHA-1: 266b6cd5be2a1a1d6fb55e9e6c5dc25f1d52db97 SHA-256: 15424a23f1126a5b9650512e145c38de06855875fe5ee18c74bdc2cc6912117b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also features numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://tsraccountants.nl/mailing/images/photo/file/31759558626.pdf In PDF document text
    • http://danchrisjewelry.com/userfiles/file/80992388605.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/37175324114.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/domaretaxatujoninokewazav.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/xorerovo.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210926111433.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1632423422.pdfIn PDF document text
    • http://kunbot.com/upload/files/71720379906.pdfIn PDF document text
    • https://renetravel.ro/images/files/27634509890.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/rodaxukiw.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/gesofomijanadodakewabatus.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/33857753520.pdfIn PDF document text
    • https://linardi.ru/files/file/79609370334.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/72825544599.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/jetopifafadapuwodij.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/26012615720.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0077265850ccd7c79cef6c439a6af783/70148710279.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/xiluferumelitewu.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/zogepa.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/1102192221.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/24028072783.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/jamafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=own+vision+in+lifePDF 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_off0000e458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 10024 bytes
SHA-256: 4aa7aa00268826ca09591557ac9adfc58cff39e9d1dcea845a04d980de082107
font_02_sfnt_off000112db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DB 19932 bytes
SHA-256: 3b650c27fac4808fa36341c78ad400b4bb94657aa09759b07a5a28f22f108c1b

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