Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b44add7bcb3b7b4…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 17:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 2399af0da720b255ba9024dcde998fd6 SHA-1: bf00a64a5e7bdd50b317ee4fc319b0d49e445a69 SHA-256: 2b44add7bcb3b7b461919a2f05fda0dbb2fb9a1fc55ec25a60cd0c1f823afdee
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 0.9955

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://philabc.ru/uplcv?utm_term=solving+systems+of+equations+worksheet+answer+key PDF link annotation
    • https://cs-nippon-cp.com/mailmagazine/upload/files/kanevufisasub.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/davutokegewevorelonadaso.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/parujuguzedipasusen.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/81155213125.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/febeli.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/vokugusukugefa.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/tiwefuvuxexodep.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/norajidufupufikojozezufeb.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/vimoxixadeterowi.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/tebebol.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/gexeziwexogivozo.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/jebenatoxuwa.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/winodaxim.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/nivorazivonukixonawubodin.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202192642640.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/11053376442.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/22307696235.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/penibin.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/87178968843.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/rikuzuxidonezutelago.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/12361755293.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/mubuk.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/80808144676.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/navenitopowowiwugapiwav.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_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 11340 bytes
SHA-256: 3d670072801c4cad5ec557f7637acffd26aa88bba8daba5c744ecbf5ac4d3ff9
font_02_sfnt_off00010e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 17176 bytes
SHA-256: e0b87dac681d48faf1c2f370338d94643e280ef59c5120ec124a96c6e2cf3196

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