Malicious PDF — malware analysis report

Static analysis result for SHA-256 314f42e98737998c…

MALICIOUS

PDF

53.5 KB Created: 2020-04-13 09:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1386e8f0dcef7ad84a2dce28e60cb3df SHA-1: b0e2c34bbcad070f1effcf61252dea4158001390 SHA-256: 314f42e98737998c4a55bcd253d472f229057505d10db5dc7aca4ccb030e64cf
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 with numeric slugs, indicative of a link farm or SEO scam. The document body, though partially corrupted, contains the phrase 'Fiebre reumatica tratamiento casero' which is used in one of the external URLs. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://stopeurocide.com/uploads/1/3/0/6/130640191/130640191.html#fiebre+reumatica+tratamiento+casero
    • http://shelleybeard.com/uploads/1/3/1/4/131406663/vatel.pdf
    • http://theartistscollective.us/uploads/1/3/0/9/130969051/fenujutawifa_xinafekur.pdf
    • http://jaered.com/uploads/1/3/0/5/130539875/zamixu.pdf
    • http://globalafricadiaspora.org/uploads/1/3/0/6/130620300/ranowi-zedazofovekij.pdf
    • http://laurenzimak.com/uploads/1/3/0/6/130620528/mopovoj-finizabudamox-xupasi-vozuxopipuxa.pdf
    • http://tomtopal.com/uploads/1/3/1/4/131453901/3895390.pdf
    • http://diracommunity.com/uploads/1/3/0/6/130620778/2445008.pdf
    • http://vandemot.co/uploads/1/3/1/1/131163935/fcff3810def375e.pdf
    • http://rickli-art-schweiz.com/uploads/1/3/0/7/130776428/c780ebfa0c188.pdf
    • http://assclubquadnatureportneuf.com/uploads/1/3/0/3/130323630/9513308.pdf
    • http://bcdebate.org/uploads/1/3/1/4/131453274/5391094.pdf
    • http://andrewspink.org/uploads/1/3/0/8/130873994/kesegetuf.pdf
    • http://corvetteslimited.com/uploads/1/3/0/7/130776446/9ae02c1ec28ba9.pdf
    • http://rachaeljustcreates.com/uploads/1/3/1/3/131383708/bokur_sapadad.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_off0000a5fb.bin
fbe989c9c1376d2660f156449c22e353ec87e8dd9aa5fa3f2c4af425e7fc9522		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5FB 9648 bytes

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