Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ff74481845ce60…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 21:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6214fcf6c6a43aa191c67cd8ee7dc126 SHA-1: 4958bc9df87ae21d59cf89c98b5fe8f334e8ce6e SHA-256: f2ff74481845ce608ab714e3fb8f8efe7ccf74a120e659143fd57ce951245c3b
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 0.9960

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 http://chiaranannini.com/userfiles/files/fadiwiwafenivetivaj.pdf In PDF document text
    • http://influences-vegetales.eu/assets/Image/files/22941881599.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f3b52efaf---fimuvite.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/85578760101.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/89749081860.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/jadanejakugijawu.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/nitunabufiwudesejirudul.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/regep.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/zoseripiwebazugamikuvef.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/jutidepomudorevejidigamol.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/lejitun.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210904005630.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/kezasusizakovusaw.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/kijalozuduban.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/vamarojivo.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/53171830693.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/42850617208.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/zatusuxabu.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/81187231535.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c07e3dbb5---89273406321.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/legabopawanovil.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/vesuzide.pdfIn PDF document text
    • https://ocw.tw/uploads/files/71847237302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+secret+of+the+old+mill+pdf+free+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_off0000d601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD601 17476 bytes
SHA-256: 3d2522aa7ff27ad9c1550a80be2384d4f3993de1c287d5558b0f85fbcf141441
font_01_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBE 10932 bytes
SHA-256: 4d862aa02840619a62a158c89bdf310cc0a0bde6427235b1ace40e53087aee80

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