Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c4e8ffe112e1e9…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 12:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f995cd061267006ed48dcae13bcad89 SHA-1: 3eb9e5748ebacd40cd892b59c40570124000167d SHA-256: d3c4e8ffe112e1e9463431d6ae60634a86f691cc744d5a5d61af4e48272ce622
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, potentially leveraging embedded JavaScript for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://xinge168.com/uploads/files/20210915192220_485336.pdf
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/80423947415.pdf
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/11692288528.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/90387126057.pdf
    • http://solo-reisen.com/media/images/file/10876136546.pdf
    • http://www.39koratmachinery.com/file_upload/files/nerepeforipunilagaxa.pdf
    • http://sswjeans.com/files/54108859508.pdf
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/12295686039.pdf
    • https://hyosung-gulf.com/uploads/file/gemirirol.pdf
    • http://libertyquad72.fr/userfiles/file/65491742652.pdf
    • http://vector-food.pl/userfiles/file/likefizafesoba.pdf
    • https://medbillings.us/lightspeedweb1/file/wopodirosojebimana.pdf
    • http://stmrcstvm.com/userfiles/file/54562362568.pdf
    • https://loppisidjupdalen.se/images/uploaded/file/97425306190.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/03942b9b7e3bf31e8da839d506a1a941/sekivotujogiz.pdf
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/lafis.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/nenobolinibopireju.pdf
    • http://fatamorgana.fr/uploads/assets/file/sezarotiso.pdf
    • http://secureyun.cn/uploadfile/file///2021091815063883.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/lgmhuicaul91dem17922trgk7f/20791909528.pdf
    • http://geraldinekilkelly.ie/poduvakomixavegup.pdf
    • http://japan-railpass.info/images/blog/file/rijifen.pdf
    • http://les-dvorik.ru/userfiles/file/76525138191.pdf
    • http://supair-lux.hu/ckfinder/userfiles/files/98138229268.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=kabbalah+for+the+student+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFF 16792 bytes
font_01_sfnt_off0000d311.bin
6f34778b6ba8cb424da5a818b084e2dbdb0f48e78e83e263c2b9fd9ea7e20b43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD311 15352 bytes
font_02_sfnt_off0000f9e6.bin
0b729fb7f2f87ff8e93a340011e9938671210e516432330fa6cce1400b74ea8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 10732 bytes

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