Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d22ce3e021e880d…

MALICIOUS

PDF

90.8 KB Created: 2021-09-13 01:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5211572b08929f87749abc2a5989c4db SHA-1: 0ced610c90377ae258d9d88ddf1f86e1b7f62a92 SHA-256: 6d22ce3e021e880d29c79388035d2fab8eca0f033921c87191cc0afa269c5c25
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains or link farms, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dakhoathienhoa.net/images/files/21798434410.pdf
    • http://legalinet.eu/userfiles/files/lesejuji.pdf
    • http://ltmetal.com/userfiles/files/26478341466.pdf
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/xavorafelodon.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/kpfnnkblt1fl41esdvm8phffcg/4481991022.pdf
    • http://contextuae.com/resimler/files/19071509336.pdf
    • https://bluetact.com/ckfinder/userfiles/files/94333142614.pdf
    • http://nikacarpet.nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/30208935607.pdf
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/43288821504.pdf
    • http://cbafjvn.com/uploads/userfiles/file/xazomutinafosuferexub.pdf
    • https://drrajanmahtani.com/userfiles/files/mutevativ.pdf
    • http://proclima-membranes.ru/userfiles/file/dawemorakosazo.pdf
    • http://chinamakina.com/userfiles/file/bizub.pdf
    • https://bselink.com/userfiles/file/bobopujamaluwalil.pdf
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/97015097276.pdf
    • http://urs-certification.com/gais/image/file/5390374214.pdf
    • http://carshopm.com/js/upload/files/87887280400.pdf
    • http://vaynhe.com/upload/files/28713504558.pdf
    • http://shijijiaming.cn/filespath/files/20210904215412.pdf
    • http://farmaciafoglia.eu/userfiles/files/83766578361.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161329ac10b2cc---zaduzime.pdf
    • http://leguido.net/files/56987569691.pdf
    • https://www.ruchya.com.tw/upload/files/90155524662.pdf
    • http://phelieuviethung.vn/upload/files/17776634760.pdf
    • https://istanajp.net/contents/files/moxofiwupizarotaboge.pdf
    • https://anukulagrotech.com/userfiles/file/ropikutujejufevadi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+crow+eaters+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_off0000febe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 16792 bytes
font_01_sfnt_off000116d5.bin
bb81853bd25913bc5cd2d69c11bcb673e18d2fa6f0dd424b43799c6487431908		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116D5 10524 bytes
font_02_sfnt_off00012f08.bin
6800343bdf1cf66e417d2796c7a72e15321df6128729a0c186bda67b63226379		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F08 18124 bytes

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