Malicious PDF — malware analysis report

Static analysis result for SHA-256 243b4d0691135688…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 15:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23f669f9b87a03f783237cd87dc155fb SHA-1: b6621f732d0c31b455344bb3aa94898ab0df62fa SHA-256: 243b4d0691135688c55754993232de2aa91506c219406b4ce2890441bd8af74b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm. The presence of JavaScript suggests an attempt to execute code within the PDF, likely to redirect the user to malicious sites or download further payloads. The overall structure and numerous links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gppacdatabase.net/userfiles/file/gadokodiwomafora.pdf
    • http://sincaremedicaltour.com/js/upload/10637642880.pdf
    • https://valeaflorilor.ro/img/uploads/file/4233031812.pdf
    • https://zoomkish.com/basefile/zoomkishcom/files/88963452819.pdf
    • http://lica-mpt.it/userfiles/files/gozapubeb.pdf
    • https://sokole-tps.pl/userfiles/file/japeguvedoduta.pdf
    • https://pemaboutiquehotel.com/assets/userfiles/files/vadijugegawikixupozepo.pdf
    • https://reaga.net/js/ckfinder/userfiles/files/komozoxutuzexarejewu.pdf
    • http://ajmason.com/admin/ckfinder/userfiles/files/gekirujuluwapetoxokaf.pdf
    • https://stvorki.ru/files/file/68786913835.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/51257843342.pdf
    • http://9275522-travel.com/userfiles/file/44475245507.pdf
    • https://hfbee.tw/upload/ckfinder_temp/files/20210903124917.pdf
    • http://csc-027.com/userfiles/file/20210921181253_ie0flg.pdf
    • http://americansemitruckparts.com/d/files/7181210822.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/58251882828.pdf
    • http://phuocthuan.vn/images/pic/file/16859731187.pdf
    • http://kientrucphatloc.com/upload/files/xumoredetej.pdf
    • http://colonia-hausmeister.de/uploads/files/25209831921.pdf
    • https://weborder.cloud/userfiles/file///71019769164.pdf
    • http://tetraeng.it/userfiles/files/lususoxizosexebedojikizoz.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/fnkbk85lp0rhjkv54aq49m6qf2/toniselinifenafiluge.pdf
    • http://huntland.hu/upload/file/kosavilefisurivul.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/592561e7cec2e78a6f678fd1b1b24258/kutikixuraforudarabenop.pdf
    • http://becucci.it/userfiles/files/43094375150.pdf
    • https://silverlabpupsforsale.com/userfiles/files/24344130242.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=extreme+asphalt+car+racing+mod+apk
    • 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_off0000b101.bin
aad3e8f5044a7ae0976c86430e241b4317bbfc8abaac57f9a30c18ee107ca0b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB101 11140 bytes
font_01_sfnt_off0000ca9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9F 16792 bytes
font_02_sfnt_off0000e2b1.bin
63507bb44627dc5753db160809bfc27af28446978270d7dbbf7d40ea26a38a05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 15700 bytes

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