Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2aed889bdbd781…

MALICIOUS

PDF

93.9 KB Created: 2021-09-20 08:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 658d82ef2d394a1d1952c57465d4f2a3 SHA-1: 9c22c719fc14fe1a9440ed3bfb3b5e98e7898780 SHA-256: ec2aed889bdbd78158a7fe0cc9eaaf73f0ae338c71bfe32444336a50d3462598
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dar-tom.pl/userfiles/file/narizoronawu.pdf In PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/43329895210.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/25741379919.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/kuzelebirivemogukesiw.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/19633336048.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/80496831356.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/wawasigakuzofidurofulinax.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/69641977124.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1ai/files/file/wagefenomi.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/konaduzotetuxuboxepejode.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/58974890819.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/wameterefigeg.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/954289955.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/fepugizavotojalagebapewet.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210918092506.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-07/210907001743079539pbbvrrkpowns.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/2211154165.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/girusobenobu.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210915161227_716951771.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/bibixaronebe.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/bunabivew.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/26573723473.pdfIn PDF document text
    • http://teresachild.com/upload/files/kajivufitorofazabigoj.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210909_016E224F881A21EC.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=watch+best+in+show+online+free+123moviesPDF 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_off000104d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 11232 bytes
SHA-256: e3acc768aee0c51d8e3d9b7ad66d77ba4cb228e733181eb079aff910f77f9b26
font_01_sfnt_off00011f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F29 19344 bytes
SHA-256: fe4b7f8299b94ef3965cdcea22b2138e0c4eed0f7cce697a49dfe7ec6a03fb5c
font_02_sfnt_off00015210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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