Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd260ca6fdf26020…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 15:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 122bba27d4e15491796808d3e4457f29 SHA-1: 11021f68a3bf1f5b15d70b3f91ba3b092ec580c9 SHA-256: fd260ca6fdf26020acfb296f9f1ecf46f9e693fea78285fcdd352606c64ef974
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=top+10+upcoming+phones+in+india
    • http://anapro.com/ckfinder/userfiles/files/gekura.pdf
    • https://izometal.net/mm/file/18501145548.pdf
    • http://levakov132.ru/userfiles/file/72610508832.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2f8f51cab---goxewadefewewakazok.pdf
    • http://phuketdriveschool.com/userfiles/file/30782557110.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/52656790069.pdf
    • http://sanzmendia.com/userfiles/files/bafazobesakoxurizad.pdf
    • https://textmakareknutsson.se/upload/image/tibiminowesav.pdf
    • https://duragloss.pl/userfiles/file/23110359284.pdf
    • http://upservice.expert/admin/ckfinder/userfiles/files/7187461129.pdf
    • http://hsaltsj.com/uploads/files/sekepapibazomotemijijo.pdf
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/vukakogetidax.pdf
    • http://interwork.sk/userfiles/file/8891949619.pdf
    • https://gamma-electronics-eg.com/userfiles/files/53610920009.pdf
    • https://vzglavniki.net/data/file/66626114896.pdf
    • http://meimagedance.tw/ufiles/files/dopobitepiwimaxif.pdf
    • https://zapcdn.space/web/img/podborky/files/32713021001.pdf
    • http://ttfi.org/app/webroot/userfiles/file/90689094956.pdf
    • https://slotpt2.com/contents/files/95788605515.pdf
    • http://www.ondebiz.com/userfiles/file/fanuzalibigugener.pdf
    • https://igruppe.no/ckfinder/userfiles/files/19374516223.pdf
    • http://pincailight.com/zk/UploadFile/file/2021092512000873499.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cf36e7044---92915101529.pdf
    • http://georgecourey.com/fck_user_files/file/96575667457.pdf
    • https://iqrainternationalschool.org/_assets/files/pufodazakopamawuv.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_off0000b105.bin
66dc183e184616d142e5d5f58f260f63e1ca145f8e6ca54d2a2a0687d623bf71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB105 16192 bytes
font_01_sfnt_off0000da24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA24 16792 bytes
font_02_sfnt_off0000f23b.bin
b30ae7aadd2cfa042ecf09d450f0eafee1d3d1d3d7ed95cb5fa59ca5971f3193		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 10956 bytes

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