Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9915ea16a09cab7…

MALICIOUS

PDF

47.6 KB Created: 2020-04-02 07:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c861c22ef5b31ba3c70c6bd6032a457b SHA-1: f39afb7a982710be11dc7ef7582705aaf12bfc0d SHA-256: c9915ea16a09cab7d4e4b52e259d54ab45e572fe7d83e48bd5b70102ea961332
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1598 External Remote Services T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to similarly structured URLs on different domains, indicating a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure.

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://eqdnala.com/uploads/1/3/0/4/130483478/130483478.html#ejercicios+de+factorizacion+expresiones+algebraicas
    • http://ldconsulting.org/uploads/1/3/0/8/130874629/fedadolokami.pdf
    • http://tecnocamp.academy/uploads/1/3/1/4/131407106/3762540.pdf
    • http://catalinapools.net/uploads/1/3/0/5/130588380/d9e8133c2b.pdf
    • http://devauzet.de/uploads/1/3/0/7/130775647/dd7788e20.pdf
    • http://jamesoflinn.com/uploads/1/3/0/6/130604215/jebapufu.pdf
    • http://dlrius.com/uploads/1/3/0/7/130740510/zipabugilodor.pdf
    • http://sticklevarietystore.com/uploads/1/3/0/8/130814349/bilesojorux.pdf
    • http://earthmammablog.com/uploads/1/3/0/7/130738711/nipufanelegopitunez.pdf
    • http://fixersinalgarve.com/uploads/1/3/0/5/130588281/suzib.pdf
    • http://thelollipopshoppe.net/uploads/1/3/0/4/130436521/vepavu.pdf
    • http://artgoneviral.com/uploads/1/3/1/3/131379041/4346007.pdf
    • http://berkeleyfpdocs.com/uploads/1/3/0/5/130545429/kagiguvesatopi.pdf
    • http://marketsocket.com/uploads/1/3/0/5/130540366/6482734.pdf
    • http://thetinyballerinaproject.com/uploads/1/3/0/6/130639611/lixafepawuzejujoxew.pdf
    • http://oreganics.com/uploads/1/3/1/0/131069812/aee3d973193d8a3.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_off00007b7b.bin
c88f241b1e35d38c5a82ce519a9d51bc5142c7950b7216e1524dbcfd8653fc49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B7B 8452 bytes
font_01_sfnt_off00009a78.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A78 16036 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.