Malicious PDF — malware analysis report

Static analysis result for SHA-256 75591041da386076…

MALICIOUS

PDF

40.8 KB Created: 2020-04-05 06:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 203458ed909174f5382f1232c9e9d6ea SHA-1: 2b35405155f048549de28de415b85664d3e385c1 SHA-256: 75591041da386076841f7a51abc599585b4524f3b389844e4a2f1866eb8c4e12
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded external URLs, indicating a link farm or distribution mechanism for other content. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings confirm the presence of numerous external links. No scripts were extracted, but the sheer volume of outbound links suggests a malicious intent to redirect the user.

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://sunsetbleach.com/uploads/1/3/0/6/130640028/130640028.html#first+edition+d
    • http://bailigongyulechengshoujiban.br3h.com/uploads/1/3/0/6/130621152/4196d16cec.pdf
    • http://wolcotthill.com/uploads/1/3/0/7/130776898/weduke.pdf
    • http://www.medinamathlessons.com/uploads/1/3/0/2/130292110/4905847.pdf
    • http://henrymohrpta.org/uploads/1/3/0/7/130739492/5458199.pdf
    • http://lokallinks.com/uploads/1/3/1/3/131397970/76874b3cf6b4.pdf
    • http://mountain-thoughts.com/uploads/1/3/0/4/130488493/8054532.pdf
    • http://michaelbisutti.com/uploads/1/3/0/4/130476687/2b4b0d1.pdf
    • http://ablelawnandtreecare.com/uploads/1/3/1/0/131070829/vezig.pdf
    • http://saveonsalesforce.com/uploads/1/3/1/4/131453665/jopex.pdf
    • http://happybellyf2f.com/uploads/1/3/0/6/130605476/94b783.pdf
    • http://johnrosseconomics.com/uploads/1/3/0/6/130620757/kebokopesol.pdf
    • http://cartegraphic.com/uploads/1/3/0/7/130776032/dezerub.pdf
    • http://brandingspell.com/uploads/1/3/0/3/130323510/85d0c.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_off0000768b.bin
aaf14686fe1622b984e1a8513bac9c2f0ef73be5dd4edbac246df395ecdced79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x768B 8220 bytes

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