Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d4e917862ad48e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-22 15:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d60a8e2ab07ba2a671bea291897f7cdd SHA-1: c4953369d0fa95c9e88c8cdf3072481765da9864 SHA-256: b3d4e917862ad48e51523e0f69b6316475f39ad7886cb93dabb5abe37c6ad362
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to disposable domains and employing UTM parameters, which is characteristic of phishing or scam campaigns designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to facilitate the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dkmmotor.com/files/userfiles/file/woraragekowotiwurur.pdf In PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/2141888860.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/pitupuvimunokazina.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/48879036128.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/41552263759.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/momenisiren.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/72438068352.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/nebimonoza.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/mipegopafuvewunuz.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210904_6DD03556F54131E1.pdfIn PDF document text
    • http://pileki.com/imgup/file/10849876106.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/zoxuw.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/lenul.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/pudegugi.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/fefuzavozadexoxetiropotis.pdfIn PDF document text
    • https://alohasafaris.com/files/62129175430.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140cbf23cf1f---10228773577.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/91680256423.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/30630393370.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/norexupagoxuwovaxuv.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/63506768429.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/76707770958.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090610540373499.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/74830809441.pdfIn PDF document text
    • http://adveotec.com/img/file/juvebuwarepisom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=among+us+free+windows+downloadPDF 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_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 16120 bytes
SHA-256: de2eaba7df779e170325715b600c8f74f231551edd2976a2313d0ef6ea5213f6
font_02_sfnt_off00011c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5E 10764 bytes
SHA-256: 65462e8d72e9b862cdf65434c367e9759d40893680182ed63919882f8352a71d