Malicious PDF — malware analysis report

Static analysis result for SHA-256 597961e7be1f8918…

MALICIOUS

PDF

78.9 KB Created: 2021-09-10 20:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d1ff9b21452c105dc48b723ffe69023b SHA-1: f74d4612efdd28ba2d5cb1e9ecff3866b2fd8fe4 SHA-256: 597961e7be1f891894ca065ed77a969eb06035c2402de3b4af12b84c52e21db0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crewmak.ru/uplcv?utm_term=3d+brush+for+android PDF link annotation
    • http://bwc.lt/i/66918189986.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/53605491239.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/32933662474.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/18085140476.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///87539533609.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/raxaxipuniz.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/bexonapori.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/87476530478.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/23279199848.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa36d72e00---dojopomomajaxarev.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/97066193743.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/vimojumuvapipogikipukit.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/vomalulinojo.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/60191653097.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/wevelafuxoxibirof.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/5558014053.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/rosapidixigi.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613551f980279---mipadefezukofatuxoditep.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/jobusawefor.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/46396297920.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/2159708270.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/23888327786.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021941434364418.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_off0000ce6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6B 10492 bytes
SHA-256: 58dea84c01b8960661e91a1a54e764d4d795ab0eb0ce0d08c0f360dd738e016f
font_01_sfnt_off0000e619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 18132 bytes
SHA-256: 93dc7ea3d752ec491e3ad03d5579f160faa51304e7d48bb52af90d5e47abf6ea
font_02_sfnt_off00011589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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