Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4c5c3303ac2b54…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 15:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 875590c6e84298bd20be443208114a87 SHA-1: 41d25c2c3bd9a195961df7bdcedd46c700344449 SHA-256: 8b4c5c3303ac2b54aa258b8a76925989ad4f3edd2d156e0325a43da32345dfd8
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 0.9974

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 https://smidgel.ru/uplcv?utm_term=firebase+cloud+messaging+registration+token PDF link annotation
    • http://ziva-muzika.cz/files/file/71017763089.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/zatalebafape.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/gaxajajevolosebuf.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134052264e3e---4193100829.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/ruvoxowine.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/35446358867.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/mojori.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/posamesuji.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/natulelekasiko.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/divum.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/vokogak.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/16111774055.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/dejolunekeravawi.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/22575651246.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/novutetigodumukalipok.pdfIn PDF document text
    • http://getdol.com/page_data/file/54585569531.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/78049290754.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/37156633586.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f3c4530f---negizumamameruwudixadom.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/nefavegexovekekurotut.pdfIn PDF document text
    • https://trieurodata.ro/images/file/zomukigogawevenupekopuwun.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/59419252552.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/vaxopirudenobesegavo.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/42403985163.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/55343793655.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_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 18100 bytes
SHA-256: 18cff69fb7022871e77def6bfe130f8f0aa1728e5ff76b7bdfa8aa340bc9894a
font_02_sfnt_off00012669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 11020 bytes
SHA-256: e4b224242ac29fc2b22b36f5e1288a5c5408d4827e857b5c2f5adab594d1ee16

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