Malicious PDF — malware analysis report

Static analysis result for SHA-256 da513a17a786f31a…

MALICIOUS

PDF

39.5 KB Created: 2020-04-15 08:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f08c11a93282714b42c4ed8de211b728 SHA-1: 38dbfdb87c85fa3eb576a5ad5f1ecae080ac46c6 SHA-256: da513a17a786f31af17769418ffc0ca2cdfb3acda758620c716ea937e4300870
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or a distribution mechanism for malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample, limiting the ability to determine specific payload delivery or execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://culizel.com/uploads/1/3/0/2/130289801/130289801.html#acid+rain+presentation+pdf
    • http://trinityplantsale.com/uploads/1/3/0/5/130545627/zetosidojanutat.pdf
    • http://shanesmi201.blog/uploads/1/3/0/7/130738693/rosifeguf-kunamiz-pasezibigazevin-ramiforuk.pdf
    • http://crowsfeet.org/uploads/1/3/0/7/130739142/6b81518c9d.pdf
    • http://k2scope.com/uploads/1/3/0/9/130969419/4cc7c15b47c3.pdf
    • http://davenralston.com/uploads/1/3/1/4/131406735/wobepadepudameturuxe.pdf
    • http://powermoveswithnikkolopez.com/uploads/1/3/0/7/130776336/640516946b7a81.pdf
    • http://confederatelabs.com/uploads/1/3/0/9/130969982/mopudedebagodel.pdf
    • http://charlottedwi.net/uploads/1/3/0/6/130621719/nuzuvuselarut.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056c5.bin
d79ef7541c895e7fe386890223dafb29dbe0e349810701fb5d12035db255cf49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56C5 7140 bytes
font_01_sfnt_off000072e8.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E8 2652 bytes
font_02_sfnt_off00007c51.bin
42fec308b7cab2f393414e9bdc1a6bd25b4aa0b9070acde390e3b63ffb91afd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C51 16100 bytes

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