Malicious PDF — malware analysis report

Static analysis result for SHA-256 c258a4c2cddcbafe…

MALICIOUS

PDF

70.1 KB Created: 2021-09-22 19:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fcec7474cf62eef557fd001e2b268e09 SHA-1: 1e735fd5752eeb2ca992395e52852a6c1c8a1270 SHA-256: c258a4c2cddcbafef838001220ca238a5fa6f2fc2685eede7bc0bd5a23afe7db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and external links point towards an attack pattern involving directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://catamma.ru/uplcv?utm_term=iwatch+sync+with+android PDF link annotation
    • http://vitalchurchesinstitute.com/files/file/10169054395.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/39512238836.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/4212158728.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/54253697447.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140811c6f2fa---12415972821.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/zomeva.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/durefopukumufijinunig.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/28675852374.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/wesilisoromese.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b7810728feed6cc62ea0dea89ce17f3b/lunoxofoberoxewupixagu.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/dilojejivejiluse.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/vozowusezuwumojake.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/22020356155.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/29300136739.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/25047377974.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/41146699378.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/14879721432.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/fenijetovisemidalir.pdfIn PDF document text
    • https://yasacompany.com/upload/files/fozexarojoruz.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/85130319167.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/96676524403.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/ludisato.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/sesazegi.pdfIn PDF document text
    • https://tcremich.lu/files/files/38147615103.pdfIn PDF document text
    • https://maviet.vn/upload/files/66017355577.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/fidovuvugedujowi.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_off0000b29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29D 15912 bytes
SHA-256: a855708e8466be11970175a9c4e466fe4f3cbec0a67eb6a415e02310533595d2
font_01_sfnt_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 10440 bytes
SHA-256: fa845e7830dfaefa90a4edccbc73823f1bfce3de032d1f9437d6de43fb937cfa
font_02_sfnt_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1