Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d529048431cfcc…

MALICIOUS

PDF

88.1 KB Created: 2021-09-10 16:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b0f6bed6e62458f9e72bdcf55bbcc113 SHA-1: 13b42e51a472db9054c9e2cc7c0a395189a4fbf7 SHA-256: f1d529048431cfccf5bf26dd14805781d5d2b11833b53b49fbf15738568b3c2d
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 0.9976

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://pistant.ru/uplcv?utm_term=visual+novel+games+android PDF link annotation
    • http://apmnir.ro/fckfiles/file/suviwanejuxon.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/9926803880.pdfIn PDF document text
    • https://isleo.com/i_photos/file/13426641710.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/95471480475.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/wobujaxapetatu.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/zobamuketik.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/46408896293.pdfIn PDF document text
    • https://longhoang.vn/upload/files/83768958731.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/pagonekuxudukukodo.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/77835175696.pdfIn PDF document text
    • http://clingac.com/d/files/rezezanupapo.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/41851163798.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/nixabibolak.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/birarufeluligifozelaxi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161367e7a84226---topobiretalaz.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/43015821917.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/jolekojepepodofagilej.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/kenodivogi.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/69ea5033d6e08e98c78517b0908e66bf/logobizojefemijifozafu.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/fikorosamagow.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/94006104329.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/gudenajisokejejavusisev.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/95045996032.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_off0000f5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FE 10628 bytes
SHA-256: a23cb40a838120847bcab2b85eed7c8ff686a02d00dbb4f071c33cef4dddb48c
font_01_sfnt_off00010e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12623 17296 bytes
SHA-256: 363f3feb42b1757b530bad2b3529762e051e398d4d5d6df35bb41b2bb8f8f49f

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