Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72ccaa4af1b268a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 02:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 56d4de69a476ebc87ce8b81f06cc4225 SHA-1: 7e54358afdf748785d2cdec2554fbfae0d477f34 SHA-256: c72ccaa4af1b268a628408d579241b7d3c1b25a7fef0ce9526580449c029cb86
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to multiple external PDF files hosted on various domains, suggesting an attempt to distribute further malicious content or phish for information. The presence of embedded JS and numerous external links indicates a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://seattlebestteriyaki.com/uploads/files/reviweketonijo.pdf In PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/wuvopemono.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/29ccde47dc274623a075dcecd90ed221/44961496013.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/poviritorakup.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/28269245831.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/44164238232.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16141cc48778ec---52690004166.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/zafevukatekedoji.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/nakosolijudixedisovanadu.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/mutusam.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/43290166092.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/81032616861.pdfIn PDF document text
    • https://phr4u.com/files/ruvigepujedi.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/gakozesesazekikin.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/gidipivudazokumajadi.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/54953467135.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/giwisor.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/28369183551.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/37358419624.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/36095985366.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/12721509387.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/rebid.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/wodebedewon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=watch+home+alone+2+online+putlockerPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 18064 bytes
SHA-256: 7ef75cc023a2cb363586735d31855dd8754f6230f33331eb2218b39b0a7ef21f
font_02_sfnt_off00012082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12082 10776 bytes
SHA-256: 561cde879c2f56fa2e94983de539d1e333413313824d3dc2977b6797dba1252d

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