Malicious PDF — malware analysis report

Static analysis result for SHA-256 346a068039c090b7…

MALICIOUS

PDF

80.3 KB Created: 2021-09-22 21:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 407ea34374406b15c18cd10f5e8d99fc SHA-1: 2a439377c49fa65f9c091794797fbb9751082ada SHA-256: 346a068039c090b7a77ff0f4afd1d8a7a8853becf20b648c26300005ef34d86e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior. The presence of external URIs suggests an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://infrive.ru/uplcv?utm_term=pdf+clip+studio+paint
    • http://cieplej.pl/imgturysta/file/26207657230.pdf
    • https://terlickodds.cz/www/www/fckphotos/file/12130239770.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/6j3mavvbq0liq6gedl53a00d23/48965081272.pdf
    • https://bevasilicones.in/userfiles/file/disegez.pdf
    • http://supair-lux.hu/ckfinder/userfiles/files/dovonanitolitesalagudo.pdf
    • http://hoangnamjsc.com/upload/files/11293379720.pdf
    • http://roberthalasz.eu/uploads/file/sumuneme.pdf
    • http://ekvatorbl.com/userfiles/file/pugoninoduguziwive.pdf
    • http://volker-issmer.de/userfiles/file/91770012190.pdf
    • http://nbc.com.vn/ckfinder/userfiles/files/zigavofonuwujop.pdf
    • https://leosservices.com/userfiles/file/29880597367.pdf
    • http://sk4education.com/ckfinder/userfiles/files/96193054312.pdf
    • http://innersolutions-uk.com/file/sivonozotikumidolifenomi.pdf
    • http://songhandiban.com/uploadfile/file/2021091409344773499.pdf
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/regarofejer.pdf
    • http://hublihorse.com/uploads/userfiles/files/nadabimobibivik.pdf
    • http://architettoannalisatinelli.it/userfiles/files/bafivugidokewefupagasukef.pdf
    • http://a2hgghk.handylover.com/upload/files/gusetitetinimuwof.pdf
    • http://chroscina.com/userfiles/file/bililozovafutitajuwedoni.pdf
    • http://3t-t.com/User_File/UpFile/file/20210920094500_em9kZXZhbWU=.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140c3d9db263---vebifasonosegotekipogu.pdf
    • http://svazekobciorlice.cz/userfiles/file/fejijubupawata.pdf
    • http://tarnava.eu/user_images/file/guzes.pdf
    • http://gemculture.com/userfiles/file/39587822136.pdf
    • http://1night2day.com/UserFiles/file/rumeguxugisuwazemesar.pdf
    • https://cfaegaianascente.pt/portal/userfiles/files/25731074323.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_off0000d3b2.bin
61bfdf80b0b77fc44db6cf7bafb237cdd8bedd42da895f614faec416ffe79d29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B2 18356 bytes
font_01_sfnt_off00010363.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 16792 bytes
font_02_sfnt_off00011b7a.bin
6af3ec5d78e16c34c8f54875e416503ac4b91316a7af1e5058c257516d2bd8b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7A 10480 bytes

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