Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7889f40a2359022…

MALICIOUS

PDF

83.0 KB Created: 2021-10-04 18:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8f5ce09b99ad746e4ecd7a161001f0c SHA-1: 0b99f2581dbfbb719b1058c1441be36f83a52508 SHA-256: c7889f40a2359022028520c04dd4aa51dc22e5bba609d50bff153a539e7ca995
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

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 https://laborke.ru/uplcv?utm_term=butterfly+of+life PDF link annotation
    • http://kjphotocon.org/data/userfiles/files/kalotupimu.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/wotexivoledi.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/22533537005.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/83471525595.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/rupijirerawidulepetavu.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/nuwexafuvavubisitag.pdfIn PDF document text
    • http://rideco.hu/upload/file/rinevu.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/95548828351.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/folapojenamuroloremesum.pdfIn PDF document text
    • http://generaldistco.com/images/file/20481578116.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/23475394702.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/32682359787.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/joxitiropa.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/jetosapu.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/5833072004.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/28309846233.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/14080788423.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/31300777000.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/61450777404.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/97810683581.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/61879351415.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/dubikalinaguvuvobine.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/86772810210.pdfIn PDF document text
    • 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_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 19864 bytes
SHA-256: 8de4ed1076b650fdfec675bb7c679f7b034c2af7e38b0b0a88373bace92d7ac4
font_01_sfnt_off00010feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 10040 bytes
SHA-256: 935d94df7f51dbe3518a9b9b50701486f863ada0d115c873e5fd0b1a669cacb6

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