Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c41736e7b0839f…

MALICIOUS

PDF

75.8 KB Created: 2021-09-12 04:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84d11acc235be4c1db69caf8e18a7ddb SHA-1: 1885fa369fdf775053868ac524dde801f7e9ad3c SHA-256: e6c41736e7b0839f5cecef47275a410ea50bca26839b05b26afe78584cde4a53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link aggregation, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://windsbs.biz/files/file/genomovubemados.pdf In PDF document text
    • https://777mto.info/contents/files/fukomewi.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/1296162714.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/51426816177.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/nakusunomilijez.pdfIn PDF document text
    • https://rjpexport.com/files/terosowoguguxofeg.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/13100083014.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/93835815377.pdfIn PDF document text
    • https://media-get.com/userfiles/files/ronalugi.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/pitofinekaniri.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/94065514563.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/nisozel.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/36578544600.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/56254587162.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/jopapenupej.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/50497632373.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/84740528426.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/8678482071.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/dozubi.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa8958daf7---soxotijiwebifazukake.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210901144837857.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/xizasibolexak.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a4730cb1d9dd560bdf68290d3edcc091/ketisox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=exam+present+simple+and+continuous+pdfPDF 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_off0000c336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC336 17308 bytes
SHA-256: 2aee4976e1843d1f24cf7b8f1e9df40b79073a0e7cf8abb1fe27090285010ea5
font_01_sfnt_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10820 10964 bytes
SHA-256: 494b516d62e66c03a414c9c50ceb9810d95e84d23f2fad6a0b4d8d5d24188d60

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