Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7248733be7e4ac…

MALICIOUS

PDF

140.1 KB Created: 2020-04-19 11:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 08c7e05d6d0cf58d18d113a1f3329088 SHA-1: 55af1f5de0faaf74743893bda25f79e21be27a6e SHA-256: 7d7248733be7e4ac0455d90d45a7e2dbf4414bbfc9743fc2a30c6c7b910bf5b5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of external links to various domains, many of which appear to be part of a link farm for SEO purposes. The ML classifier also flagged this PDF as malicious. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8004

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://talluriphotography.com/uploads/1/3/0/4/130477083/130477083.html#ashrae+standards+handbook+pdf
    • http://houstonprobateteam.com/uploads/1/3/1/4/131483588/jezafeme_junutol.pdf
    • http://marychristineart.com/uploads/1/3/0/6/130604979/9481438.pdf
    • http://apartmentsbastion.com/uploads/1/3/1/3/131384583/6099061.pdf
    • http://hiddendiyosa.ca/uploads/1/3/0/6/130639899/2177336.pdf
    • http://getmoorestyle.com/uploads/1/3/0/5/130543568/4391391.pdf
    • http://garrettotahair.com/uploads/1/3/0/6/130639300/60afc7ab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e206.bin
38cadc44a1e29bfb0855586df5522f1b9dfd925263ae1890ff7d5a94839bc451		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E206 1672 bytes
font_01_sfnt_off0001ea0a.bin
191d3b915e986374b42c3a35919f6e77185c6b4ac35137749c138ccfce374e53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA0A 10012 bytes
font_02_sfnt_off00020ec7.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20EC7 16036 bytes

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