Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8000ae7b6ff41a9…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 04:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b633f50cf0222534ffbe4c77e4f0fc3 SHA-1: 954c1a8d8ede0be91d1878ab037de01406e4805a SHA-256: a8000ae7b6ff41a9f10cd1c3aa180f4350de009aa6ccfc1be0decef3f8db7d1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting a malicious intent to distribute or phish. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classifier's high confidence score point towards a malicious phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=conversion+de+epub+a+pdf
    • https://agriplan-rs.com/dados/ckfinder/files/82643019332.pdf
    • https://profm.hu/files/file/362722412.pdf
    • http://spain-ex.com/images/blog/file/25825174519.pdf
    • https://glamweddingdesign.com/userfiles/file/fikipudivukutetipazal.pdf
    • http://busankid.com/webfiles/board/file///49776573816.pdf
    • http://karthikeyanjayaram.in/userfiles/file/wopepa.pdf
    • https://interconformity.ro/images/file/79648206813.pdf
    • http://xecuoihuyhoang.com/uploads/userfiles/file/62890083228.pdf
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/63512377386.pdf
    • https://oxfordjsr.com/userfiles/file/danebugomonerapituropef.pdf
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/60429440578.pdf
    • http://bjxbw.cn/userfiles/file/bimovolosizikufo.pdf
    • http://zgic.ru/!upload/files/77571142577.pdf
    • http://4bzsoftware.com/Images_upload/files/18222289422.pdf
    • http://zerosquareonline.com/file/mufupas.pdf
    • http://kruengrangthai.com/files/files/xofewijowef.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161452b26d906f---54124669633.pdf
    • http://peoplefoster.com/pliki/34606879159.pdf
    • https://devcons.org/uploads/userfiles/files/gevejuraxuduzesatagoresi.pdf
    • http://actybrain-consult.com/Upload/files/835940433.pdf
    • http://nieruchomosciklodzko.pl/files/file/kapiduwon.pdf
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/tunevaso.pdf
    • https://pushtypathshala.com/demo/aims/files/images/files/13983214359.pdf
    • http://autothudo.vn/upload/fck/file/manep.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_off0000c297.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC297 16792 bytes
font_01_sfnt_off0000daae.bin
bdfd87118cc659a1a87626d4c6f74642fac0c67e7a70c6ba498fdf7d95d93a10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAE 10684 bytes
font_02_sfnt_off0000f31f.bin
d44c659e5dd2da0cca6071d10041e77bb4ecd8f376b766e74d54c86acd97928a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 16360 bytes

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