Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d8a4a0506ad677…

MALICIOUS

PDF

76.3 KB Created: 2021-09-09 11:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: acb2d6513b20fb334c3b57a12cf841c6 SHA-1: 2d77f41c4c745777abf0274a5368d086db1ecb8c SHA-256: d1d8a4a0506ad67776143c2ba5c575a68aaa82c63409759d29751a3710be6f6a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The high number of external URIs hosted on disposable domains, coupled with the ML classifier and ClamAV detection, strongly indicates a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=dungeon+of+the+mad+mage+maps+pdf PDF link annotation
    • https://csmgh.net/pevron/www/img/file/vawotoku.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/jexedesaromix.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/42722145841.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/32101769103.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/47735938246.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/74028988533.pdfIn PDF document text
    • https://apra.pl/files/file/54368362307.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/zoguxodofokakaza.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/vezogox.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/kalelebuzopodixu.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/zinifuwanubofopu.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/59118191242.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16130726cc01c8---gokuxir.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/taxujugaluxeloliz.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/68604245656.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/22420030641.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/wogaxuladazedi.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/90814363033.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630718691.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/61281602257.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210909102943_YmlzZWR1Zm9tYWxldGVkb21vdGFqZXM=.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/busilu.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/83391244754.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_off0000c40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40C 10808 bytes
SHA-256: 8b033d69e77c577008da10de2dae139a8440bc28163d0e48f21fff10e8cea2b3
font_01_sfnt_off0000dc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC98 18180 bytes
SHA-256: 411d064d1d5f5753f7714c67f4193d5b524925157092ca9526ae6cdf5e21d30b
font_02_sfnt_off00010bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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