Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dd13dbed6fa516e…

MALICIOUS

PDF

38.3 KB Created: 2020-03-30 06:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: efeff856c5a1b3688cbc9bba0c0d9ec1 SHA-1: c7e9466315c6af2671f8c727828c7209047fc713 SHA-256: 0dd13dbed6fa516e955dc0d1a8461f69ac6d40c341c25bd8e5d0b2a32b530eb9
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a tactic to manipulate search engine results or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this. The document body text is heavily corrupted, but the presence of URLs within it and the heuristic firings are sufficient to assess the likely attack pattern.

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://74-123-75-199.mgwnet.com/uploads/1/3/0/5/130541209/130541209.html#hosanna+to+the+son+of+david+lyrics
    • http://mymissgrace.com/uploads/1/3/0/7/130776409/litijoge-nipanumo.pdf
    • http://pediatricinstitute.org/uploads/1/3/0/5/130547728/zujigelu-burumo-nepowos-bofiviniwuvakob.pdf
    • http://rockypointmissions.net/uploads/1/3/0/6/130621363/347ab996a.pdf
    • http://mingcamellia.com/uploads/1/3/0/8/130813975/b49242ccdcf68.pdf
    • http://campingwithjoe.com/uploads/1/3/0/5/130590126/2c326ad.pdf
    • http://kasselov.no/uploads/1/3/0/2/130287367/dac374.pdf
    • http://brewergronvall.com/uploads/1/3/0/6/130621531/1165751.pdf
    • http://bottomshirts.com/uploads/1/3/0/2/130287514/mipap.pdf
    • http://goaboutgal.com/uploads/1/3/0/4/130435619/4875346.pdf
    • http://spencerfinancial.net/uploads/1/3/0/7/130738769/41ae285.pdf
    • http://sanpanchostacos.com/uploads/1/3/0/6/130639720/225cc8cd8ac06.pdf
    • http://redseamsathletics.com/uploads/1/3/0/2/130272092/28a60b645a3fe7.pdf
    • http://jhowardmath.com/uploads/1/3/0/6/130640139/ruzonabiwiwo.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/
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c03.bin
f4f23a0a5565b1163ea58327892e89eac21f90a3647be55948f5c3d20f2e9c3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C03 7644 bytes
font_01_sfnt_off000079d1.bin
cf5f4eabf78883a7b00995f1969764e421bb578a7e80489366717efe1a72abc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D1 5572 bytes

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