Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc6718062122958…

MALICIOUS

PDF

82.9 KB Created: 2021-09-11 17:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e8bf1ddd2176aa51d5d463bdd2cd94a SHA-1: 4396ba8cd58a9b958d4dc5964c850b58f7afb4e5 SHA-256: cbc671806212295836efb1d82e5e9698a7bc98b46ffaa3a14218d15920bdef49
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or redirection to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://advantagelic.com/singhania/downloads/file/zulodunez.pdf
    • http://www.naraihillgolf.com/admin/userfiles/file/mometakumo.pdf
    • http://nikolalepojevic5.com/multimedia/file/75522686807.pdf
    • http://nessium.fr/userfiles/file/71069323129.pdf
    • http://artdealer.vn/upload/fckimagesfile/ecb245c3148bda2d67fce002b835526e.pdf
    • http://piri-piri.pl/ckfinder/userfiles/files/67699787074.pdf
    • http://jar-ted.pl/file/63113931628.pdf
    • https://mamadona.ru/ckfinder/userfiles/files/vixavawata.pdf
    • https://dukra.sk/editor_uploads/files/gujuxatize.pdf
    • http://aallergy.netlovestories.com/upload/files/26580091010.pdf
    • http://www.flamanville-76.fr/upload/file/fomut.pdf
    • http://lnv-cnc.gr/userfiles/file/pefasokelezasajesojuzok.pdf
    • https://yodobashi-church.com/pebitugesiwusotinipeboset.pdf
    • https://tkquiz.com/userfiles/file/supida.pdf
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/kotofexaferonunegex.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/duzerupapimaf.pdf
    • http://cukiernia.eu/upload/files/94349854145.pdf
    • http://15881588.com/ckupload/files/ditowo.pdf
    • https://bankkartya.hu/js/ckfinder/userfiles/files/datomowugiwewutoju.pdf
    • http://vako.vn/app/webroot/uploads/files/28835997658.pdf
    • http://www.39koratmachinery.com/file_upload/files/xazazivaf.pdf
    • https://adikkedua.com/contents/files/logovoxitane.pdf
    • http://eros-arena.com/eros/userfiles/file/safoto.pdf
    • http://purepassion.pl/userfiles/file/velagila.pdf
    • http://frickcontrols.com/uploads/files/vupufaruvewaniwukulewalip.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/51e3fe849c9c05f491c6b414c0778056/90112472808.pdf
    • https://mayxaydungthienlong.com/uploads/files/files/zikixabisejadokadiwuxewe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=netzwerk+a1+workbook+pdf+free+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_off0000d521.bin
499b401fc8153cdd389ffdc9359f3c39f9404d51381ab5ea3cc52cad70df7572		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD521 10640 bytes
font_01_sfnt_off0000ed7d.bin
dc72bc07a0a8611648bada842048788359e5ff6df7c704318b490d19efe4358c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 21380 bytes
font_02_sfnt_off0001258b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1258B 16792 bytes

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