Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbaebafeff6e765…

MALICIOUS

PDF

67.5 KB Created: 2021-09-24 18:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 24c1fb84a9f69c5762bda8a4ef4635e9 SHA-1: 00f94cb50ee22dff80a4380d2dafa395f497c416 SHA-256: 6cbaebafeff6e76529ae374c63c80467ebeb1d072ae21d7108f911e7ca942322
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many of which are hosted on suspicious domains, suggesting a phishing or link-farming scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is used to distribute links to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://artasedanasingaraja.com/uploadfck/file/39273313903.pdf In PDF document text
    • http://daming-school.com/userfiles/file/16020630195.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/90417388141.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/29463346042.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/zulobavozafo.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/zufuxejojeriro.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/98107634703.pdfIn PDF document text
    • https://tpk-m.ru/files/file/dojekivedegaw.pdfIn PDF document text
    • http://agavietnam.com/img/files/kesidavonoxamufito.pdfIn PDF document text
    • https://senegal4d.com/contents/files/xawalefaveravexupixine.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d917e77121---tifiximewojebidupasonopes.pdfIn PDF document text
    • http://rnralpha.cz/res/file/93826713664.pdfIn PDF document text
    • http://ymmicro.com/files/files/31496723598.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/29894620129.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/gofug.pdfIn PDF document text
    • http://w-mill.jp/images/file/7208133694.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/durilonafogakodajobo.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/gabopipozikanuma.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/6417127892.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/69488396314.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/derupuju.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/tunuxoxekulebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=twd+new+episodes+2021PDF link annotation
    • 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_off0000ac4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC4A 10324 bytes
SHA-256: fe35a6c917b246e122b6b9cb9a3dd108b6d841313a955d9b2d4477d6c2bab3ac
font_01_sfnt_off0000c3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 14828 bytes
SHA-256: cc701db307f5550ef8d38c4427d85015e97d61735846b9521e2e6effbd5f7043

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