Malicious PDF — malware analysis report

Static analysis result for SHA-256 4151e10fd45b92f0…

MALICIOUS

PDF

71.7 KB Created: 2021-09-17 16:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9285a35d724ea43e6f41a842f709dac SHA-1: cb856f0b9fa239d3ca693f4cf86a01cc66a01f11 SHA-256: 4151e10fd45b92f03479f5b9cbaff059f9e5efa3af28ee878e0187dfbf73bbd9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating the PDF is part of a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://szabobuszrendeles.hu/files/files/15510832083.pdf
    • https://arbormaster.net/uploads/files/xowibotewuwedo.pdf
    • https://pasationtravellers.com/root/FCKeditor/file/zoxikadokedom.pdf
    • https://twr1115.net/files/fckeditor/file/76316200873.pdf
    • http://abwhopewell.com/uploads/files/87972752433.pdf
    • https://yodishit.com/uploads/userfiles/file/75392903547.pdf
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210915181109.pdf
    • http://pastoret.it/userfiles/files/kitarasitixeri.pdf
    • http://theaterbuehne-schwandorf.de/userfiles/file/54119383098.pdf
    • https://ganganagardentist.com/userfiles/file/60013868459.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613469d0310a6---kepowiwowodidozek.pdf
    • http://thetsaban3watnuea.com/UserFiles/file/8681568572.pdf
    • https://ahreco.com/uploads/news_file/butowagavaronimibogavolu.pdf
    • http://dalboncostruzioni.it/userfiles/files/99461308978.pdf
    • https://redengewinnt.com/userfiles/file/93199338004.pdf
    • http://minerva-collection.net/files/files/97248002227.pdf
    • http://pass38.com/images/contentimages/files/90527005237.pdf
    • https://stockbauer.hu/uploads/file/75886151441.pdf
    • http://silesiacapital.eu/data/file/61006964902.pdf
    • http://romengo.com/ckfinder/userfiles/files/92290058041.pdf
    • https://myvideoclasses.com/ci/userfiles/files/kuvevusewukaf.pdf
    • http://willowslakerhea.org/userimages/26443884970.pdf
    • http://asiadomainstore.com/userfiles/file/kuzukem.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d48b27b6b3---53713945082.pdf
    • http://laskod.hu/userfiles/file/dozufagigapafemipuva.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=heroes+of+order+and+chaos+mod+apk
    • 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_off0000b549.bin
9c762d2139f1cf8ce25829c6c4a91dfbb8bbd5eec8361504d371b2b47bdba1b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB549 10732 bytes
font_01_sfnt_off0000cdb6.bin
72cdf955f75c0f139eebd36c47d755cf47bb6d94bf67ee12839eb67797437265		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB6 16680 bytes
font_02_sfnt_off0000f8d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 16792 bytes

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