Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40fd879d9ed9ff3…

MALICIOUS

PDF

55.9 KB Created: 2020-04-04 08:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bc4d15385b87dec30ef6df77a39b1e66 SHA-1: 2832e2ce4b6bc0c1e3466b20d12996ae96ae19f5 SHA-256: e40fd879d9ed9ff3838f96503b897f525a5274fcc849236ddc9b4cc2c9274d4a
92 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links to other PDF files hosted on various domains, indicating a potential link farm or redirection scheme. The document body contains garbled text and a single URL, which is also present in the heuristics. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 3

  • 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
  • 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://marengineering.net/uploads/1/3/0/4/130435763/130435763.html#frase+sobre+natureza+e+paz+tumblr
    • http://sfcomet.com/uploads/1/3/0/4/130483519/8744090.pdf
    • http://empoweredlifebydesign.com/uploads/1/3/0/2/130289475/632ae97f2871e97.pdf
    • http://yasinrahim.com/uploads/1/3/0/7/130776562/mosewizuje.pdf
    • http://ferritergroup.com/uploads/1/3/0/2/130288391/faxeme.pdf
    • http://harmoniouslymad.com/uploads/1/3/0/7/130776558/zesixuwurup.pdf
    • http://marmarworld.com/uploads/1/3/1/3/131383943/sojevetobomomufotu.pdf
    • http://miakumamoto.com/uploads/1/3/0/5/130551749/6172274.pdf
    • http://lesondecloches.com/uploads/1/3/1/3/131379820/gakojixuxekekowupeba.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006111.bin
b3fc47f6b49bee9f6ade9bc8c9fd31371f9971cfbce348093858b836096ee3c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6111 9584 bytes
font_01_sfnt_off0000808d.bin
9a0acaa4e599bd77f0ad51add6126c25aea21f543148107c72d18ba0b8dcb204		 pdf-font-stream PDF embedded font (sfnt) at offset 0x808D 2764 bytes
font_02_sfnt_off00008a52.bin
fa2614d2a1721574fa8ac952d114ba459fbdd60a537f1e3ef31b77f0832d3fa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A52 13132 bytes
font_03_sfnt_off0000b30b.bin
4e7fe905994d1123d5bb111886faea89a3b0df9cd7f5cc36e9f64110a0ef0466		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB30B 18524 bytes

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