Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ddbc005c0bae65f…

MALICIOUS

PDF

43.4 KB Created: 2020-04-05 13:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 15e921639af321e44bc3ed028b4263fe SHA-1: 4599d9f9c3411aaf8681e37e3b0753f759c0763f SHA-256: 4ddbc005c0bae65f430ff95ce50388d1cf84e32c71d3c5317126aa640c4f1547
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body text, though partially corrupted, includes a Spanish phrase related to cost analysis, suggesting a potential lure for users searching for such information. 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://chromaticrealty.com/uploads/1/3/0/2/130274098/130274098.html#analisis+de+costos+unitarios+pdf+peru
    • http://metalroofexpertwitness.com/uploads/1/3/1/4/131483097/6885991.pdf
    • http://bridgewatertherapeuticmassage.com/uploads/1/3/0/3/130379243/fupukimawizika-gebanajinemud.pdf
    • http://jenniferrudyphotography.com/uploads/1/3/0/8/130813117/b59f305d6d1a6d.pdf
    • http://engineeringjournals.in/uploads/1/3/0/8/130874606/zozomix-jukeponot-tedax.pdf
    • http://stevencombsmusic.com/uploads/1/3/0/5/130551192/forufupi_wotagedureri.pdf
    • http://granite-alexandria.net/uploads/1/3/0/6/130622013/9215857.pdf
    • http://ruk-ev.com/uploads/1/3/0/2/130272586/tenapadozosiwemiki.pdf
    • http://karstonchong.com/uploads/1/3/0/7/130738979/walab.pdf
    • http://spraytansbymichelle.biz/uploads/1/3/1/3/131380592/3863302d9968.pdf
    • http://rfjobstoday.com/uploads/1/3/0/8/130813827/7362373.pdf
    • http://jackhauser.com/uploads/1/3/1/4/131453109/pewerisadenim.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_off00007341.bin
80b92905fee967a44c9dd5e434cfbd902ea1eed18b814809f85cb55a4ddcd33a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7341 9332 bytes
font_01_sfnt_off00009525.bin
63f5e27ee3d24cc00d413e59c301cc73ab377383609796993547673f2bea898c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9525 2600 bytes

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