Malicious PDF — malware analysis report

Static analysis result for SHA-256 5500c3e3b1144b13…

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 22:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a71e28453ce9c26aa3455d0be294f59a SHA-1: fd87190c5bfbd1e14fb406d514a9a33b90e78eb4 SHA-256: 5500c3e3b1144b132212a07d5a84b60057749b5c29d5b621cb198538d23a4089
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 http://scouttautomotive.com/editor_uploads/system/files/losamezamogalazur.pdf
    • https://promise-land.com/upload/file/gesadez.pdf
    • http://www.bluefashion.cz/ckfinder/userfiles/files/defakegaxoxoxeno.pdf
    • http://angelofthewinds.org/ckfinder/userfiles/files/tidepixosetupej.pdf
    • http://edu-soft.ru/site/htmlimages/file/32447658778.pdf
    • http://blackhorsesc.pl/userfiles/file/mekigujezawuladolusipuxoz.pdf
    • http://esenkardeslerinsaat.com/resimlerfiles/20674606589.pdf
    • http://jncs.kr/page_data/file/20210913130308.pdf
    • http://upnbkk.com/file_media/file_image/file/43228117455.pdf
    • http://sevinctekstil.com/resimler/files/liketaxof.pdf
    • https://firsatpin.com/calisma2/files/uploads/76678412340.pdf
    • http://candientushinko.com/images/file/fifopopijux.pdf
    • https://ardiinerkh.mn/uploads/userfiles/files/3747347366.pdf
    • http://naphogacomposite.com/upload/files/57983995052.pdf
    • http://dvg.asia/ckfinder/uploadfiles/files/89210536839.pdf
    • http://cjmfgx.morefriendship.com/upload/files/10911155780.pdf
    • http://pijntherapie.be/uploads/files/88068080349.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6b971d1fe208f3d0789ade62f19a928b/begepugigi.pdf
    • http://thankschicken.com/uploads/files/pusezuvogibozisili.pdf
    • https://andana.us/files/files/59416067830.pdf
    • http://aodaiminhhanh.com/app/webroot/uploads/files/pumowi.pdf
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/20135731274.pdf
    • https://benmoonpharma.com/userfiles/file/bumojunefituxo.pdf
    • http://autosoftware.company/autoresponders_images/files/93136745704.pdf
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/mideforadonelimib.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613638e2ad75a---nagajirewoninaxegugisivi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gta+v+mobile+apk+download
    • 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_off0000ccd1.bin
4ede4fdd8b37ad77c9542fc16f3000ad969c7955928e89cbc69d58434d21bdc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD1 17176 bytes
font_01_sfnt_off0000f92b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 16792 bytes
font_02_sfnt_off00011142.bin
bea6bc886e986628346750f0ba290056b761bd60ad52347550c08dd7981bd0d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11142 10708 bytes

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