Malicious PDF — malware analysis report

Static analysis result for SHA-256 310cb7fe6c35695f…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 05:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c524f1ea1218e8cda51d01a27832c16c SHA-1: ecddc646ea90959528946f18227d3a70eb4e5994 SHA-256: 310cb7fe6c35695f9b7c19640b628919412577725a5474abdf85b1caaa45980a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm on disposable hosting. This suggests the PDF's primary purpose is to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pernambucoimortal.com/imagens/files/52805434094.pdf In PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613619e6c2614---gaxelokugexisa.pdfIn PDF document text
    • https://redac.ch/upload/79247670090.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/xipezeburefetosugoselen.pdfIn PDF document text
    • https://ms02bet.net/contents/files/zumavaj.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/62231193865.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/78165759966.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/lajasikupipodadik.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/86946230536.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/badoxuleb.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/nogule.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/bovotinojukupunarekilaki.pdfIn PDF document text
    • https://tckontrola.hr/files/rixivozopoxedabeteroduz.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/bezatuvawewud.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a3e0f7e3.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/31643732369.pdfIn PDF document text
    • http://benly-carson.com/product/files/xibunufudarapidos.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/rurewasanazotawisa.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/mozimevikameravur.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/xudazu.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/suzodisekazerixojasibesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+i+move+pictures+from+phone+to+sd+cardPDF 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_off0000e1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D1 11084 bytes
SHA-256: c2112618c0eceee72730494c41db9a6dde8c5863db39e9744ab9165440fa5716
font_01_sfnt_off0000fb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB75 18440 bytes
SHA-256: dae1a25fe65a141893a87d62a94e282771d0730e73e0408ebb97e6e7b98a6314
font_02_sfnt_off00012a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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