Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc33ee608d350d0…

MALICIOUS

PDF

36.2 KB Created: 2020-04-08 19:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bd97875950076a7e7b711c3af2559768 SHA-1: 184a489ed055447238d545ea0ea32aba21a9221c SHA-256: 0cc33ee608d350d064d156f1ae249d7c5b956e3ffe5024de33f341250cc6ea6e
156 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML models and ClamAV, indicating it functions as a dropper. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The document body text, though partially corrupted, includes keywords related to aptitude tests and the URLs themselves are structured to appear as legitimate documents, likely a lure to encourage downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.Dropper.Agent-8571943-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8571943-0
  • 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://avidaenglish.com/uploads/1/3/0/7/130776324/130776324.html#aptitude+test+papers+sri+lanka+pdf+in+tamil
    • http://mylivgrace.com/uploads/1/3/0/5/130589411/96d134d.pdf
    • http://ccceventcenter.com/uploads/1/3/0/2/130287914/4552680156b.pdf
    • http://tradealchemist.com/uploads/1/3/0/6/130620154/8131299.pdf
    • http://valybeautysalon.com/uploads/1/3/0/6/130639791/duderewalajef_xezebem_nigunumaj_sajifidel.pdf
    • http://uiyjhuhk.com/uploads/1/3/1/3/131379012/zuloni-dotonoparelaf.pdf
    • http://dickersoneyecare.net/uploads/1/3/1/3/131381363/xamuguju-lugolubowa-ribewowofovum.pdf
    • http://psykhoshop.com/uploads/1/3/0/6/130621836/9152207.pdf
    • http://korioconnell.com/uploads/1/3/0/6/130639326/koxov_pegurikudekifod_getuzemufof_robuxulesina.pdf
    • http://balancewithbrooke.com/uploads/1/3/0/2/130288818/d5ee899.pdf
    • http://gtitactsimulation.com/uploads/1/3/0/7/130739928/ketol.pdf
    • http://nedrenygaard.no/uploads/1/3/0/7/130740592/vabupekusozesijexeru.pdf
    • http://motitaweb.org/uploads/1/3/0/5/130545260/2004715.pdf
    • http://cookiejoneswrites.com/uploads/1/3/0/7/130776185/bevuxaj.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061e7.bin
a76fe9ce27825e3b5d4a8d669d0d6d14133f88551a017aef425efe6bd5963919		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E7 9396 bytes

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