Malicious PDF — malware analysis report

Static analysis result for SHA-256 402d79b0664649ce…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 14:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 6576f607ff2c5c436588be43bbf878dc SHA-1: 72e6e645baa3a638ccf9c98d7d72a6938a800299 SHA-256: 402d79b0664649ce26a7f963fa8f86f6822d6d49607a217bfe776930539ee9ed
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to redirect users to a network of potentially malicious sites. The embedded JavaScript likely facilitates the redirection or further payload delivery, aligning with common phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3586

Heuristics 5

  • 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
  • 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://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/dedaxobagunexede.pdf In PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/dufapebujogapaka.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/52622757148.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/leduvabemoxusi.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352255da9ee---75615309917.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/85799822645.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/ragilibuxe.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/falurejexuv.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/79814364749.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/33388507539.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/37818994025.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/bijojezafoginabav.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/69725403140.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/85135527591.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/hfssh48i0h224uolk7j3mlubm6/nemupixetozili.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/makujakojavi.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/21425487591.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/tetabudaruweg.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/4425053929.pdfIn PDF document text
    • https://laser123.com/geektic/files/sedowenufusod.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/bupamapubipipub.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/dovawumuzufurobutir.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/48223621862.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/17661409828.pdfIn PDF document text
    • http://baove247.org/upload/files/fediwu.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/90384240815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=go+west+1925PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e431.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE431 17364 bytes
SHA-256: bed4570a5a17eaae044794d03329e90a7365a337132564a309523a41df2f0b15
font_01_sfnt_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 10196 bytes
SHA-256: 244819c80b2a4d30ce50e86c73e4c3798eb479a8de449a5046498f90d3b6cc3e

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