Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bde75d471c6b7ee…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 08:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d9b0100fc89fac3997abd5a9bc48da1 SHA-1: 1e642a1c8bcf5598646c4e6827764424a06714e1 SHA-256: 0bde75d471c6b7eefb688294fb277adb62007c136b82de05e71421957a7141c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or redirection mechanism to phishing or malware sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, indicating a tactic to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=operating+system+is+an+example+of+which+software PDF link annotation
    • http://anhuicrew.com/upload_fck/file/2021-9-5/20210905184558805574.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/jugenufapi.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/52563202976.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/zaseniwemigejopidarasaki.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/mepiri.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613934a4c006a---36384408776.pdfIn PDF document text
    • https://asiapharma.la/files/files/58961848213.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/dajolorugonejer.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/71480136832.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/37869284336.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/26102657799.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/29536099329.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/97766059744.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/37860300265.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/66015016044.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/29033254297.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/53030070982.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff4929f77d---wevetapigi.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/23034866709.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/46527160999.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/kizikuleraguna.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/tuwagofitijiloxolorazenov.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/71596966704.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/53334211433.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/sazes.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_off0000dd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 11252 bytes
SHA-256: 9e8a045c0515260da873b553806b78d6e0a54230e4d4c977a320c71863e3e4ce
font_01_sfnt_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBC 17140 bytes
SHA-256: cdd836a9ffae414d036a374b193aaf258d0cfcd782abe37ace4a187697449c67

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