Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dac819cc03f92cc…

MALICIOUS

PDF

78.9 KB Created: 2021-09-25 11:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 42e04ad317bb7beffa66db27ca3c121d SHA-1: a8328f83780776f108bd7779e82bff9c9dd2340b SHA-256: 2dac819cc03f92ccbd2b7db9211eaa8e450efca1bbc3239b2ab6b52220f31412
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external, potentially malicious sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The presence of external URIs suggests an attempt to redirect the user to a phishing page or download further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=magic+tricks+mod+apk PDF link annotation
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/63979283187.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/zezixopaxusomawopejedapal.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/47212111601.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/kojilakanidoniwebesuxu.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/57507849457.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/20285417532.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/rulor.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/79878821030.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/leviveburejo.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/5803037019.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/48321343135.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/99209078783.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/86779474808.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/wapotenexerer.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/76843740511.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/20444988572.pdfIn PDF document text
    • http://metabolit.ru/files/file/66447255713.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/wurabujatag.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/89745925544.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/wagipaderawamodeni.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/84486071431.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109140155139002.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1eba94884---73078526308.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/20563693581.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_off0000c522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC522 10660 bytes
SHA-256: e251a8ff5e0263d1e4536a6ec365baf99fa519db0dbac094277f8ddfb4162ac1
font_01_sfnt_off0000dd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57E 21768 bytes
SHA-256: 69c447acbf745ee830a0acebf2db83ad070c9c3397a2a067c71b6039398df923

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