Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b09c8c28688234…

MALICIOUS

PDF

30.4 KB Created: 2020-06-11 18:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b5b247c5a4050255c321ab90acb8244 SHA-1: b37968fca86bc40d143ea6e6f97ce486398bd644 SHA-256: d8b09c8c28688234713ea94a5831a26b339bccb8412c2f616d45d52111166bd3
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, many of which point to files with numeric slugs, indicative of a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains text related to 'worksheet for urdu writing practice download' and numerous URLs, suggesting a lure to download further malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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://positives-management.de/uploads/1/3/0/5/130539297/130539297.html#worksheet+for+urdu+writing+practice+download
    • http://lesliedickson.com/uploads/1/3/0/9/130969529/800113.pdf
    • http://mdguruconnect.com/uploads/1/3/1/4/131438228/8713068.pdf
    • http://poppyandjacks.net/uploads/1/3/0/5/130589384/ruranoz-ladasafux.pdf
    • http://jlynnnutrition.com/uploads/1/3/0/4/130490410/3810992.pdf
    • http://isu99.org/uploads/1/3/1/6/131636886/2715413.pdf
    • http://zoominteriors.net/uploads/1/3/0/7/130738667/b7274ca7a5.pdf
    • http://coastalcollisionrefinishing.com/uploads/1/3/0/7/130740180/8d866663484037d.pdf
    • http://canedyathletics.com/uploads/1/3/0/4/130483385/gomoliv.pdf
    • http://slfexhibition.com/uploads/1/3/0/4/130477039/9000201.pdf
    • https://zatugizatit.files.wordpress.com/2020/06/balufozisat.pdf
    • https://suvirowom.files.wordpress.com/2020/06/budemukotej.pdf
    • https://buxanoxunos.files.wordpress.com/2020/06/jisazumeruxepuwowiv.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_off000049d8.bin
fe64b669a2d0d4c9d7b5ab6c24fd82343a7b500d866b22eb463fe217c7ef5451		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49D8 10108 bytes

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