Malicious PDF — malware analysis report

Static analysis result for SHA-256 5acb6e6be252ddd2…

MALICIOUS

PDF

71.4 KB Created: 2021-10-01 03:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e5d09e7df931e0af7554044566c7f900 SHA-1: 0874d62ec6a905ee66d70f0b37fe64f9beb683f0 SHA-256: 5acb6e6be252ddd277296e31f9ce456a5df8629a724b9277931fe3807fbfc8dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of embedded URLs and the ML_NYX_PDF_MALICIOUS heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wastran.ru/uplcv?utm_term=modify+network+android PDF link annotation
    • http://tungalag.mn/userfiles/files/54648722090.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/sasujujuvusokoliguxufad.pdfIn PDF document text
    • http://mega.kz/media/upload/files/zujutixonevijenovu.pdfIn PDF document text
    • http://chieucoingason.vn/files/fubozujoriferenirobonixev.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/divawawajusuwajitaxarid.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/33348043969.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/43078470527.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613649c057d03---35513315663.pdfIn PDF document text
    • http://cy2hand.com/userfiles/budogakurozinodojo.pdfIn PDF document text
    • http://cobmedia.hu/include/nomukikatevamubilorixix.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/61668160754.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/906dfadb81fcc18cf408c42fbcb8a46d/zeganoj.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/21773026765.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109242342111487.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/naxutazalawomiratote.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/raxifaxubiwizuturisinew.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/budagukelidenasejul.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/22505835359.pdfIn PDF document text
    • https://vleek.com/uploads/files/fidupa.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/mimadamigasuzejovogular.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/mefadabij.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/nutibavexis.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_off0000b0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C5 10416 bytes
SHA-256: b0d576c75326785a1cf24f7eb630d0ed257ae9e1d3789042f99158c6358fa5bd
font_01_sfnt_off0000c893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC893 18420 bytes
SHA-256: 742ddd7ccd5a3b46208acc5405e69ba22e3a9143017115ebe746d71aa419d9cd
font_02_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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