Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe504877bfe6506a…

MALICIOUS

PDF

75.0 KB Created: 2021-09-17 08:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 466e03dfd7238a8959f8cbb0d46d1db8 SHA-1: 2b516a459ada8565aa2fcb06e4eb23846a36427e SHA-256: fe504877bfe6506aa4aee107617db1497ffb6ee618a087cc895a939705506800
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is structured as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://chcial.ru/uplcv?utm_term=android+10+apk
    • http://hum-lucknow.org/test/fckeditor/file/71105631132.pdf
    • http://itcck.org/upload/editor/file/48410462125.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa922a123d---dodabelewupoxofewo.pdf
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tirefezezonimilefepopawi.pdf
    • https://recapress.com/ckfinder/userfiles/files/7117270466.pdf
    • http://hyundai-baoloc.com/luutru/files/37586691596.pdf
    • https://geneticapanama.com/userfiles/file/fagukatobojipogokuroxosip.pdf
    • https://mgs-on-track.com/app/webroot/userfiles/file/92772706145.pdf
    • http://yasaitogo.com/uploads/files/fopewipupuluxojoni.pdf
    • http://salman-is.com/userfiles/file/61790391832.pdf
    • https://abandassociates.com/ckfinder/userfiles/files/xufunivo.pdf
    • https://tauthuy.vn/upload/files/katigepozetofek.pdf
    • http://portaldo.eu/contenuti/upload/file/32789784203.pdf
    • http://taemyung.com/data/upload/file/zuvezijulat.pdf
    • https://powermailer.in/userfiles/file/wotujojesaledariru.pdf
    • http://vaynhe.com/upload/files/betopegavovasabexazurof.pdf
    • https://pima-alarms.net/slicice/file/valizoxulinewukupet.pdf
    • http://hagelkonzept.com/userfiles/file/guxitunakugomarad.pdf
    • https://krainaogrodow.eu/zdjecia/fck/file/gepupoke.pdf
    • https://bloomeng.com/uploads/dogexosofedareretefiz.pdf
    • http://finadev-groupe.com/userfiles/file/60982960301.pdf
    • http://grupopiscis.com/upload/files/sokapejolav.pdf
    • http://www.julietlandau.com/fckeditor/userfiles/file/fivizur.pdf
    • https://shinaltd.ru/images/file/kojapojekalimi.pdf
    • https://vilus.cz/userfiles/file/nolunikewarixot.pdf
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/50031804672.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_off0000c50a.bin
cad8271f44f2a50cae8ca23326d47bcd9c74aa209a7f954418a10af6f82854b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC50A 10188 bytes
font_01_sfnt_off0000dbe7.bin
2f6712fdb4b9342661d5f0c9ed40e120b42f29b3b6e22f04d6b6f89c74c9e46b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE7 16216 bytes
font_02_sfnt_off00010600.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 16792 bytes

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