Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e73c304a171f0bc…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 21:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c47acd7d03d42aa8f4c998bfc22e9d99 SHA-1: 3bff218f3ac7057aca2d04be327a731c759c5b5f SHA-256: 1e73c304a171f0bc8efa04b1b719f21ea6d9d779f6e36e78deaf3b050cb9afc4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which point to disposable domains and are likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bawauang.com/contents/files/74152272139.pdf In PDF document text
    • http://shanghaiqingchen.com/upload/files/zuzos.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/rodonalepadujapawugusap.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/79965509030.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/nedevago.pdfIn PDF document text
    • https://cartolmania.it/file/lirejorujidodesudavusu.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/janifepu.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/notowozitoxekiverenupabe.pdfIn PDF document text
    • https://hinaweb.com/upload/file/50823319540.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/91689842823.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/57167531419.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/pezovezox.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/lososanonoru.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/17258016278.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/suzevuwurasamunujamew.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/xaxugesofel.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/91575198082.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3198637467.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/22933784871.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613af4cebfb71---64803060228.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/fozuwabanowigojaf.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/78726962951.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/gujeputokojejavek.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/tetidelofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=dls+download+apkPDF 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_off0000d58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 10144 bytes
SHA-256: fc9b0ad34bbafafbd1c15109a05a87c4676e324b0f38ecd1f2216090f948fd5c
font_01_sfnt_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 18076 bytes
SHA-256: a414e5ca140c1d637d2632d5396c5b4e5f1265bb95cacac8624145f81623db6c

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