Malicious PDF — malware analysis report

Static analysis result for SHA-256 211e9e4b38eee0f8…

MALICIOUS

PDF

66.8 KB Created: 2020-04-09 09:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 17743d7c33600b409736fc3da26064e3 SHA-1: 9cd67608ce081f01f5386777ea1f628617a15819 SHA-256: 211e9e4b38eee0f812ddb7a8f76ff55727c7b09dd441bac76b6bafe5e7258bbf
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO spam campaign. The document body, though heavily obfuscated, contains text related to 'Nursing care plan for alcohol detox', which is likely a lure to attract users to click on the embedded malicious URLs. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://pranzotruck.com/uploads/1/3/0/5/130547112/130547112.html#nursing+care+plan+for+alcohol+detox
    • http://logisticatransporte.net/uploads/1/3/0/6/130621998/5be5e0.pdf
    • http://teaching-china.com/uploads/1/3/0/2/130271063/5664652.pdf
    • http://paths2communication.com/uploads/1/3/1/0/131070567/xifaluf.pdf
    • http://pugetsoundpatientadvocate.com/uploads/1/3/0/2/130272280/5284908.pdf
    • http://trashcancleaningboys.services/uploads/1/3/1/4/131453252/3225030.pdf
    • http://rydde.services/uploads/1/3/0/9/130969188/dugibet_munafexusav.pdf
    • http://samdix.net/uploads/1/3/0/7/130739275/nuwufalanarexolog.pdf
    • http://sweetpennycreations.com/uploads/1/3/0/5/130589276/9443c0b.pdf
    • http://soulexpression.net/uploads/1/3/0/3/130323291/041b35a46b2916.pdf
    • http://moniquedanaher.com/uploads/1/3/0/5/130539035/5256289.pdf
    • http://toolboxblack.com/uploads/1/3/0/3/130313440/624bb025911.pdf
    • http://tk-talks.com/uploads/1/3/0/4/130435592/4994918.pdf
    • http://aquaticmanagementsystems.com/uploads/1/3/0/7/130775174/6959647.pdf
    • http://kimnobleartist.com/uploads/1/3/0/3/130324416/xoroviwik_xagasozibapov_logimix_bajokur.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d159.bin
09a0bdb02cf471c2b5f1efb6fafdd9e8a875acd38fa05a299a97e8fc6e3f8481		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD159 8400 bytes
font_01_sfnt_off0000f16f.bin
6dc6e07f93ae70488a19e8a398a1c6cda2f5723fc3d3cbe180c5afbb10c3611e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF16F 2864 bytes

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