Malicious PDF — malware analysis report

Static analysis result for SHA-256 921dc274d8603e13…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 13:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: af9c8e5f5d15cafeea5fe8e7a096db20 SHA-1: a6c4bb018cda8f87a26787060ea79012e0bb1bcd SHA-256: 921dc274d8603e133de071e6492abe5fa75a14035cde767314cb8fbaacd623e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external URIs, suggesting a phishing or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying it as a link farm on disposable hosting, likely to obscure the true destination. No scripts were extracted, but the presence of external links points to a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=benefits+of+self+driving+cars PDF link annotation
    • http://natalieshuff.com/uploads/file/96629396249.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/73033688165.pdfIn PDF document text
    • http://e-district.org/userfiles/file/febonozafutekap.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/42436030380.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/21938889636.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/46189243123.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/xozid.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/zewolobemomujawojer.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/43791218923.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/7535262927.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/wigipuxibolizipojizenejis.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/12686807477.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/1599910475.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/vigapudepimaweban.pdfIn PDF document text
    • http://bienbao.net/uploads/files/17769358853.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/pazavunukeni.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/7c33d1dd584c8e892a3f39e73bf792d2/97470330108.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/xefumadojusetijisibex.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c8734a026ddc7717be1b2da4ff6d9c3b/64395662600.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/mivapawepaduwisegovaner.pdfIn PDF document text
    • http://lachina.cn/upload/file/ganonaxemobesim.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_off0000ddd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 17708 bytes
SHA-256: d901cda1708b49ffbd541ec5e25d58aee1b4999fba512ef03b29c2c6ad80cdea
font_02_sfnt_off0001241e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241E 10768 bytes
SHA-256: a7c700825877c090ca46a2ee59a9341d475beea6c93c23adca4057a78bab80ca

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