Malicious PDF — malware analysis report

Static analysis result for SHA-256 395a632c28202156…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 15:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 573908d51e55c0b170cd6d632b359ca7 SHA-1: 1a147058d93e80789f31ac48d5eaa2999b68358f SHA-256: 395a632c282021561ae6e4e5aa4bc9965b020cbe1b0c86e4a80d875f22866967
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ndc-group.ru/uploads/files/zalaxufozut.pdf In PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/99130117107.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/wurodufuluw.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/73313729360.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/zorutomomekuw.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/3670362296.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/18056222495.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/fowoxefisinuniwa.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/50410062275.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/remapev.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/11586281632.pdfIn PDF document text
    • https://avela.md/userfiles/file/98828824585.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/82431332245.pdfIn PDF document text
    • https://nomortiga.com/contents/files/navalalapimilepaxijegu.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/63467336548.pdfIn PDF document text
    • https://onecre.com/images/content/files/74915817598.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/wutejaronibeloviguz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+pie+custom+rom+downloadPDF 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_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 17412 bytes
SHA-256: 6c656e79012c3b9f3f71017ac9827f8daf2f8453630c3bc78cba7a4fad93853f
font_01_sfnt_off00010bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB7 10844 bytes
SHA-256: 556d2a7f364431897263df6f0ba61e238fbab7567ddf3ca2c6d0fbea0043edfe
font_02_sfnt_off000124d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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