Malicious PDF — malware analysis report

Static analysis result for SHA-256 e987b6a474bb8f38…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 21:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9af88c1492030bebd94a7b4f609a7120 SHA-1: f6f733465150939248507435efad8ce9aa46a2b4 SHA-256: e987b6a474bb8f386c7373737a1b2361a47c69ef6280d6ecc600a30cb2b0280d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to numerous external URLs. The PDF contains embedded URIs that redirect to potentially malicious sites, suggesting a phishing or malware distribution scheme. The presence of multiple external links and the 'link farm' heuristic strongly indicate an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • 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://crewmak.ru/uplcv?utm_term=pokemon+last+fire+red+gba+download PDF link annotation
    • http://rm-centr.ru/uploads/file/gefizovorag.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/luxepuladetenozowilelufew.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161396b0c4e26f---fukasenera.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/pogebeboboritoboviwalup.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/25621252081.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146548070ec6---96434263680.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/tudixonuludemobug.pdfIn PDF document text
    • http://fnathservices.com/upload/file/69351165720.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/86292812097.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/74955526864.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/35541804129.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/takumasifejejete.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/85652313348.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/54211815029.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/34113985928.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/76814805754.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/zofavag.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/26802283486.pdfIn PDF document text
    • http://sbkf.org/files/files/wudufonekaxefosafulekusu.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/batigariwavokuwufakijik.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/dotosa.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_off0000d55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55C 11016 bytes
SHA-256: 2df480c6910be3034773e38d8885c1b2bdec55d643302644b0a684de32f817bc
font_01_sfnt_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 18568 bytes
SHA-256: bc9d19f68a86a85efb9e18b39d4828fa83c5594ac324475c334d335cf664f46c

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