Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2d7dd7886c5e22…

MALICIOUS

PDF

74.5 KB Created: 2021-03-24 07:20:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ce8bcd423a8a03ae772b8b2c966d3bd SHA-1: 7fbc40fc38fde7dbc5055f114f696dc2c285c59e SHA-256: 6b2d7dd7886c5e223d6c830c7f52e9e809bd2261336223276ac760a11dfbd457
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains a significant number of external links, many of which are to PDF files hosted on link farm domains, suggesting a SEO spam or phishing campaign. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a browser extension or update. While no scripts were explicitly extracted, the PDF structure and numerous external links, including one to a potentially malicious domain, strongly suggest it's designed to exploit user trust for malicious purposes, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://botokaw.ru/wix?keyword=screencast+pro+apk+uptodown
    • https://cdn-cms.f-static.net/uploads/4481676/normal_600f97fb08136.pdf
    • https://dukozajaxal.weebly.com/uploads/1/3/4/0/134017298/bovomuvuxowiwegoso.pdf
    • https://bepizapumi.weebly.com/uploads/1/3/5/3/135349865/jijopewidajedojexizu.pdf
    • https://cdn.sqhk.co/veludewozen/iYegcLo/vovetezis.pdf
    • https://cdn.sqhk.co/xumesapaxoku/GFKjeLp/57555977092.pdf
    • https://cdn-cms.f-static.net/uploads/4459636/normal_5fd68d3d04d35.pdf
    • https://sesuzefodapu.weebly.com/uploads/1/3/2/8/132815176/49c2df.pdf
    • https://fuzalufukaxod.weebly.com/uploads/1/3/4/7/134714992/d8339a057.pdf
    • https://balixilime.weebly.com/uploads/1/3/1/3/131398392/9825e8f5e391c6.pdf
    • https://static.s123-cdn-static.com/uploads/4371498/normal_5ff5c3220e2fd.pdf
    • https://cdn-cms.f-static.net/uploads/4379726/normal_60477d203fd06.pdf
    • https://dobumixil.weebly.com/uploads/1/3/0/7/130738680/ponitifamusavin.pdf
    • https://kajubuti.weebly.com/uploads/1/3/2/6/132680994/xiterataxipisepej.pdf
    • https://xikipavukageza.weebly.com/uploads/1/3/0/7/130776529/c9a95.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fewunadupop/small_engine_repair_course_online_alberta.pdf
    • https://s3.amazonaws.com/dupula/kilroy_realty_annual_report.pdf
    • https://s3.amazonaws.com/zolerazowubow/explain_the_difference_between_discipline_and_guidance.pdf
    • https://s3.amazonaws.com/vosimalume/zojane.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6af.bin
629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AF 6440 bytes
font_01_sfnt_off0000e6a3.bin
add317ddb2d5717bead394c24ee83f624de1ff1f2ddd820bd139a23d9bbf6c41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 5296 bytes
font_02_sfnt_off0000f8c8.bin
4f939b492cb505eeffb0e1bab9d5e01607fbe26a7233e9fddc2cfd5ce2ac669d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 10632 bytes

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