Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3b0e77931c7b82…

MALICIOUS

PDF

76.1 KB Created: 2021-09-12 07:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 2299bfb914034a2fcf7c05f7765bb2ba SHA-1: 8f4c15f494476d89f087cb1cc056afb460500c99 SHA-256: ee3b0e77931c7b82325cf94fe98ea449bcd8ae5f1294cadad5c682f177b9155a
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://francescasciortino.it/userfiles/files/batubosologowokilobizeme.pdf In PDF document text
    • https://soudurelauziere.com/upload/editor/file/nugagowawevamorukudupat.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/wuponaje.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/goritugix.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/7976849814.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/40514853272.pdfIn PDF document text
    • https://spacio.hk/attachment/file/89596017752.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/17150716905.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/nelufularubumalixufa.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/sitenisitevupofadovedosu.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/soripawejepadarib.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/32839541064.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/sazitemunez.pdfIn PDF document text
    • http://mobilenmr.com/files/files/11664359140.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/61204449020.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/virekelim.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/63739909113.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/94079926497.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/88509467240.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/vudamapemuwezadozunogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=negative+words+that+start+with+nPDF 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_off0000c60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60D 17752 bytes
SHA-256: e1e37b893b400445f39516370d8c73132c7b018c7bf4ae31aa5698fe6a8898f0
font_01_sfnt_off0000f30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 10612 bytes
SHA-256: 11bef2465cacb749731e5cb36398db2fbc2a788a2e980115f189e64160ed4953
font_02_sfnt_off00010b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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