Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e769ccf4b157930…

MALICIOUS

PDF

51.5 KB Created: 2020-04-27 06:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e7686d8e528c6137700971965f3e9f1b SHA-1: 7a50e69bd8a8ffeb554d03c20d3d931c6791c47a SHA-256: 5e769ccf4b15793087b052e149975a2e6f7c691272f53c86736ed57002cda03a
104 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm for SEO manipulation or to host malicious content. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links indicates a potential attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://suppy-taiwan.com/uploads/1/3/0/5/130590673/130590673.html#bus+timetable+guided+busway
    • http://goefinancialservices.com/uploads/1/3/1/6/131606309/2d95ad.pdf
    • http://straightshottransport.net/uploads/1/3/0/4/130479008/kedaf.pdf
    • http://envirotechcustomhomes.com/uploads/1/3/0/7/130739628/d1ec52e1c6.pdf
    • http://h2see.net/uploads/1/3/0/5/130551641/1f43e.pdf
    • http://leoningzhuoliu.com/uploads/1/3/1/6/131636692/8c1e6ae6cd.pdf
    • http://bluebirchdesign.com/uploads/1/3/1/4/131483069/gasiwe.pdf
    • http://printercontinental.com/uploads/1/3/0/4/130436163/1918495.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000097e8.bin
3ca5aa39df3627a1c50c02d38db8701c56db61f84fa98d40ca000977482629a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97E8 8700 bytes
font_01_sfnt_off0000b96d.bin
7863b829de04ea8b7f5be4d5dae43fa62182e7611f0c3a300d10b316d27db496		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB96D 2732 bytes

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