Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2aaacaaaad7aba…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 22:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bd4c6c82b37699e135cbfb9b07bb8fdf SHA-1: c24fde4b3f2a5504120d311ff5af320512fcd49e SHA-256: 9a2aaacaaaad7aba4aea7e2010062d5772d8c0da20774f2a590ed205777bfb74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or spamming operation. The embedded URLs likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cructi.ru/uplcv?utm_term=android+alternative+os PDF link annotation
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4eed8f517---3446654096.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/xofonoxesukigese.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/tikizenoxigokobep.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/76248857676.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/31094957299.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/79249664571.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/75260464290.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/bavakiwunajegafejop.pdfIn PDF document text
    • http://poorclarescork.ie/images/35978158407.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615332ae2a633---tokamubugufikuwi.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/vimatadugofixij.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/88371574417.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210927_AB14A3873DE05AA8.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/vawibunusajonevow.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/mivebigukuk.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/82611419260.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/20707992351.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/resiwagerikunikuje.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210913034620_gmshh0.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/nedigiberaruvim.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/53857445039.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_off0000b1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C5 10288 bytes
SHA-256: 25965604a6ffb4545e5cacdc76439ee6db13bcc0102baf9a8debd294ebe081df
font_01_sfnt_off0000c90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 17240 bytes
SHA-256: 239d400eab5d1a99ab1169c55a66dc55c8cdb72c9b8a8d104e3a3a5a1e9d8812

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