Malicious PDF — malware analysis report

Static analysis result for SHA-256 467631b4495e54a9…

MALICIOUS

PDF

79.2 KB Created: 2021-09-08 16:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 901c4442d2c9f728662d4d3cb2ad174c SHA-1: dd2996c51fdbd29719eb9ed37296ff11958118bd SHA-256: 467631b4495e54a94c3de771cdacb3ed54e2348a36d697efa8f59c345ff0bf25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://tylbm.com/Upload/ckeditor/files/52599585005.pdf In PDF document text
    • http://dae-young.kr/upload/fckeditor/file/musuraxebifanobegigi.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/motezuruxijeregewazomek.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/vogufulukilemexewos.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdf13192b5---96753979239.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/83427757983.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fixamigaxupob.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/zenob.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137442563170---30705387486.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/12217258636.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/94982432408.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/pakinorokejurogel.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/4450714365.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/givodegiriwiwanat.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/08/file/20210908_032706_120.pdfIn PDF document text
    • http://peoplefoster.com/pliki/63376471628.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/66122179432.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/mijesukapov.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/55984678646.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/zuseximafit.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/99219947541.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/nizegexavugumulud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=liberty+jeep+2002+manualPDF 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_off0000d0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E8 17740 bytes
SHA-256: 81ff68a33435b6e53a5222ed658c5c1cc8f947207f7110cd39947e5138ea9ffc
font_01_sfnt_off0000fed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EF 10808 bytes
SHA-256: 7aefb0e75fb61e9c646a39391597ef1fa316f9858c1849332e0e1a0eff32b90d

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